MIDI plugins -- partial implemetnation, temporarily disabled.

2024-12-05 10:52:34 -05:00
parent 2989309728
commit 9d64cf1f92
24 changed files with 892 additions and 84 deletions
@@ -34,6 +34,7 @@
 #include <limits>
 #include <stdexcept>
 #include <chrono>
+#include <optional>

 #define DECLARE_JSON_MAP(CLASSNAME) \
    static pipedal::json_map::storage_type<CLASSNAME> jmap
@@ -592,6 +593,17 @@ namespace pipedal
                write(obj.get());
            }
        }
+        template <typename T>
+        void write(const std::optional<T> &obj)
+        {
+            if (!obj) {
+                write_raw("null");
+            } else {
+                write(obj.get());
+            }
+        }
+
+
        template <typename T>
        void write(const std::weak_ptr<T> &obj)
        {
@@ -883,6 +895,20 @@ namespace pipedal
            }
        }
        template <typename T>
+        void read(std::optional<T> *pOptional)
+        {
+            if (peek() == 'n')
+            {
+                consumeToken("null", "Expecting '{' or 'null'.");
+                *pOptional = std::optional<T>();
+
+            } else {
+                T value;
+                read(&value);
+                *pOptional = std::move(value);
+            }
+        }
+        template <typename T>
        void read(std::weak_ptr<T> *pUniquePtr)
        {
            throw std::domain_error("Can't read std::weak_ptr");
@@ -0,0 +1,135 @@
+// Copyright (c) 2022 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import React from 'react';
+import Button from '@mui/material/Button';
+import DialogEx from './DialogEx';
+import DialogActions from '@mui/material/DialogActions';
+import DialogContent from '@mui/material/DialogContent';
+import Typography from '@mui/material/Typography';
+import ResizeResponsiveComponent from './ResizeResponsiveComponent';
+import Divider from '@mui/material/Divider';
+//import TextFieldEx from './TextFieldEx';
+
+
+export interface ChannelBindingHelpDialogProps {
+    open: boolean,
+    onClose: () => void,
+};
+
+export interface ChannelBindingHelpDialogState {
+    fullScreen: boolean;
+};
+
+export default class ChannelBindingHelpDialog extends ResizeResponsiveComponent<ChannelBindingHelpDialogProps, ChannelBindingHelpDialogState> {
+
+    refText: React.RefObject<HTMLInputElement>;
+
+    constructor(props: ChannelBindingHelpDialogProps) {
+        super(props);
+        this.state = {
+            fullScreen: false
+        };
+        this.refText = React.createRef<HTMLInputElement>();
+    }
+    mounted: boolean = false;
+
+
+
+    onWindowSizeChanged(width: number, height: number): void 
+    {
+        this.setState({fullScreen: height < 200})
+    }
+
+
+    componentDidMount()
+    {
+        super.componentDidMount();
+        this.mounted = true;
+    }
+    componentWillUnmount()
+    {
+        super.componentWillUnmount();
+        this.mounted = false;
+    }
+
+    componentDidUpdate()
+    {
+    }
+    render() {
+        let props = this.props;
+        let { open, onClose } = props;
+
+        const handleClose = () => {
+            onClose();
+        };
+
+        return (
+            <DialogEx tag="bindingHelp" open={open} fullWidth maxWidth="sm" 
+                    onClose={handleClose} 
+                    aria-labelledby="Rename-dialog-title" 
+                    style={{userSelect: "none"}}
+                    fullwidth
+                onEnterKey={()=>{}}
+                >
+                <DialogContent style={{minHeight: 96}}>
+                <Typography variant="h5" style={{marginBottom: 8}}>
+                    MIDI Control Binding Priority
+                </Typography>
+                <div style={{fontSize: "0.9em", lineHeight: "18pt" }}>
+                    <p style={{lineHeight: "1.4em"}}>MIDI Channel Filters determine which MIDI messages get sent to a plugin that accepts MIDI messages. Note that the 
+                        MIDI Channel Filters do NOT affect system MIDI bindings or control bindings.
+                    </p>
+                    <p>
+                        MIDI message processing occurs in the following order
+                    </p>
+                    <ul>
+                        <li>If the message is a Program Change message, the message is first offered to any MIDI plugins in the currently loaded preset (Message Filters permitting).
+                            The message is sent to each MIDI plugin in the current preset that wants it. If any MIDI plugin accepts the program change, 
+                            no futher processing occurs. Specifically, the program change will not change the currently selected PiPedal preset.
+                            <br/>
+                        </li>
+                        <li>
+                            If the message is a Program Change message, and no MIDI plugin has accepted the message, PiPedal selects the PiPedal preset that corresponds
+                            to the requested program. 
+                            <br/>
+                        </li>
+                        <li>
+                            The message is then checked to see if it has been bound to a Pipedal feature using the System Midi Bindings settings. If it has, 
+                            Pipedal processes the message, and it is not forwarded to MIDI plugins.
+                            <br/>
+                        </li>
+                        <li>
+                            Otherwise, the message is sent to each MIDI plugin in the currently loaded Pipedal preset (channel filters permitting).)
+                            <br/>
+                        </li>
+                    </ul>
+                </div>
+
+                </DialogContent>
+                <Divider/>
+                <DialogActions style={{flexShrink: 1}}>
+                    <Button onClick={handleClose} variant="dialogPrimary"  >
+                        OK
+                    </Button>
+                </DialogActions>
+            </DialogEx>
+        );
+    }
+}
@@ -0,0 +1,51 @@
+// Copyright (c) 2024 Robin E. R. Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+export enum MidiDeviceSelection {
+    DeviceAny = 0,
+    DeviceNone = 1,
+    DeviceList = 2
+}
+
+export default class MidiChannelBinding {
+    deserialize(input: any) : MidiChannelBinding {
+        this.deviceSelection = input.deviceSelection;
+        this.midiDevices = input.midiDevices;
+
+        this.channel = input.channel;
+        this.acceptProgramChanges = input.acceptProgramChanges;
+        this.acceptCommonMessages = input.acceptCommonMessages;
+        return this;
+    }
+
+    clone() { return new MidiChannelBinding().deserialize(this);}
+
+    deviceSelection: number = MidiDeviceSelection.DeviceAny as number;
+    midiDevices: string[] = [];
+    channel: number = -1;
+    acceptProgramChanges: boolean = true;
+    acceptCommonMessages: boolean = true;
+
+
+    static CreateMissingValue() : MidiChannelBinding {
+        let result = new MidiChannelBinding();
+        return result;
+    }
+}
@@ -0,0 +1,138 @@
+// Copyright (c) 2024 Robin E. R. Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import React from 'react';
+
+import { Component } from 'react';
+import { Theme } from '@mui/material/styles';
+import { WithStyles } from '@mui/styles';
+import withStyles from '@mui/styles/withStyles';
+import { PiPedalModel, PiPedalModelFactory } from './PiPedalModel';
+import { pluginControlStyles } from './PluginControl';
+import MidiChannelBinding from './MidiChannelBinding';
+import Tooltip from '@mui/material/Tooltip';
+import Typography from '@mui/material/Typography';
+import Divider from '@mui/material/Divider';
+import ButtonBase from '@mui/material/ButtonBase';
+import { ReactComponent as MidiIcon } from "./svg/ic_midi.svg";
+import MidiChannelBindingDialog from './MidiChannelBindingDialog';
+
+
+export const StandardItemSize = { width: 80, height: 140 }
+
+
+
+export interface MidiChannelBindingControlProps extends WithStyles<typeof pluginControlStyles> {
+    midiChannelBinding: MidiChannelBinding
+    theme: Theme;
+    onChange: (result: MidiChannelBinding) => void;
+}
+type MidiChannelBindingControlState = {
+    dialogOpen: boolean;
+};
+
+const MidiChannelBindingControl =
+    withStyles(pluginControlStyles, { withTheme: true })(
+        class extends Component<MidiChannelBindingControlProps, MidiChannelBindingControlState> {
+            model: PiPedalModel;
+
+            constructor(props: MidiChannelBindingControlProps) {
+                super(props);
+
+                this.state = {
+                    dialogOpen: false
+                };
+                this.model = PiPedalModelFactory.getInstance();
+
+            }
+
+            render() {
+                let classes = this.props.classes;
+                let item_width = 80;
+                return (
+                    <div
+                        className={classes.controlFrame}
+                        style={{ width: item_width }}
+                    >
+                        {/* TITLE SECTION */}
+                        <div className={this.props.classes.titleSection}
+                            style={
+                                {
+                                    alignSelf: "stretch"
+
+                                }}>
+                            <Tooltip title={(
+                                <React.Fragment>
+                                    <Typography variant="caption">title</Typography>
+                                    <Divider />
+                                    <Typography variant="caption">Controls which MIDI messages get forward to the instrument.</Typography>
+
+                                </React.Fragment>
+                            )}
+                                placement="top-start" arrow enterDelay={1500} enterNextDelay={1500}
+                            >
+                                <Typography variant="caption" display="block" noWrap style={{
+                                    width: "100%",
+                                    textAlign: "center"
+                                }}> MIDI</Typography>
+                            </Tooltip>
+
+                        </div>
+                        {/* CONTROL SECTION */}
+
+                        <div className={this.props.classes.midSection}>
+                            <ButtonBase style={{ width: 48, height: 48, borderRadius: 9999 }}
+                                onClick={()=> { 
+                                    this.setState({dialogOpen: true});
+                                }}
+                                sx={{
+                                    ':hover': {
+                                        bgcolor: 'action.hover', // theme.palette.primary.main
+                                        color: 'white',
+                                    },
+                                }}
+                            >
+                                <MidiIcon fill={this.props.theme.palette.text.secondary} style={{ width: 36, height: 36 }} />
+                            </ButtonBase>
+                        </div>
+                        <div className={this.props.classes.editSection}
+                            style={{ display: "flex", flexFlow: "column nowrap", justifyContent: "center" }}
+                        >
+                            <Typography variant="caption" display="block" noWrap
+                                style={{ width: "100%", textAlign: "center" }}
+                            >OMNI</Typography>
+                        </div>
+                        {this.state.dialogOpen&&(
+                            <MidiChannelBindingDialog 
+                                open={this.state.dialogOpen}
+                                midiChannelBinding={this.props.midiChannelBinding}
+                                onClose={() =>{ this.setState({dialogOpen: false});}}
+                                onChanged={(midiChannelBinding: MidiChannelBinding)=> {}}
+                                midiDevices={[]}
+
+                                />
+
+                        )}
+                    </div >
+                );
+            }
+        });
+
+export default MidiChannelBindingControl;
+
@@ -0,0 +1,240 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
+
+// Copyright (c) 2024 Robin E. R. Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import { useState } from 'react';
+import Button from '@mui/material/Button';
+import DialogTitle from '@mui/material/DialogTitle';
+import DialogActions from '@mui/material/DialogActions';
+import { PiPedalModel, PiPedalModelFactory } from './PiPedalModel';
+import FormControlLabel from '@mui/material/FormControlLabel';
+import FormControl from '@mui/material/FormControl';
+import InputLabel from '@mui/material/InputLabel';
+import ChannelBindingHelpDialog from './ChannelBindingsHelpDialog';
+
+import IconButton from '@mui/material/IconButton';
+import InfoOutlinedIcon from '@mui/icons-material/InfoOutlined';
+
+import Checkbox from '@mui/material/Checkbox';
+import { AlsaMidiDeviceInfo } from './AlsaMidiDeviceInfo';
+import DialogEx from './DialogEx';
+import MidiChannelBinding, { MidiDeviceSelection } from './MidiChannelBinding';
+import DialogContent from '@mui/material/DialogContent';
+import Typography from '@mui/material/Typography';
+import Select, { SelectChangeEvent } from '@mui/material/Select';
+import MenuItem from '@mui/material/MenuItem';
+import { styled, Theme } from '@mui/material/styles';
+import createStyles from '@mui/styles/createStyles';
+import { makeStyles } from '@mui/styles';
+
+
+export interface MidiChannelBindingDialogProps {
+    open: boolean;
+    midiChannelBinding: MidiChannelBinding;
+    onClose: () => void;
+    onChanged: (midiChannelBinding: MidiChannelBinding) => void;
+    midiDevices: AlsaMidiDeviceInfo[];
+}
+
+
+function isChecked(selectedChannels: AlsaMidiDeviceInfo[], channel: AlsaMidiDeviceInfo): boolean {
+    for (let i = 0; i < selectedChannels.length; ++i) {
+        if (selectedChannels[i].equals(channel)) return true;
+    }
+    return false;
+}
+function addPort(availableChannels: AlsaMidiDeviceInfo[], selectedChannels: AlsaMidiDeviceInfo[], newChannel: AlsaMidiDeviceInfo)
+    : AlsaMidiDeviceInfo[] {
+    let result: AlsaMidiDeviceInfo[] = [];
+    for (let i = 0; i < availableChannels.length; ++i) {
+        let channel = availableChannels[i];
+        if (isChecked(selectedChannels, channel) || channel.equals(newChannel)) {
+            result.push(channel);
+        }
+    }
+    return result;
+}
+
+function removePort(selectedChannels: AlsaMidiDeviceInfo[], channel: AlsaMidiDeviceInfo)
+    : AlsaMidiDeviceInfo[] {
+    let result: AlsaMidiDeviceInfo[] = [];
+    for (let i = 0; i < selectedChannels.length; ++i) {
+        if (!selectedChannels[i].equals(channel)) {
+            result.push(selectedChannels[i]);
+        }
+    }
+    return result;
+}
+
+const usesStyles = makeStyles((theme: Theme) =>
+    createStyles({
+        icon: {
+            fill: theme.palette.text.primary,
+            opacity: 0.6
+        }
+    })
+);
+
+
+function MidiChannelBindingDialog(props: MidiChannelBindingDialogProps) {
+    const classes = usesStyles();
+    const { onClose, midiChannelBinding, open, onChanged } = props;
+
+    const [currentChannel, setCurrentChannel] = useState(midiChannelBinding.channel);
+    const [allowProgramChanges, setAllowProgramChanges] = useState(midiChannelBinding.acceptCommonMessages);
+    const [helpDialog, setHelpDialog] = useState(false);
+
+    const model: PiPedalModel = PiPedalModelFactory.getInstance();
+
+    const handleClose = (): void => {
+        onClose();
+    };
+    const handleOk = (): void => {
+        onClose();
+    };
+
+    const generateDeviceSelect = () => {
+        let result: React.ReactElement[] = [
+            (<MenuItem key={0} value={0}>Any</MenuItem>),
+            (<MenuItem key={1} value={1}>None</MenuItem>)
+        ];
+        let i = 2;
+        for (let midiDevice of model.jackConfiguration.get().inputMidiDevices) {
+            result.push((<MenuItem key={i} value={i}>{midiDevice.description}</MenuItem>));
+            ++i;
+        }
+        return result;
+    };
+
+    const getDefaultDeviceSelect = (): number => {
+        if (midiChannelBinding.deviceSelection === MidiDeviceSelection.DeviceAny as number) {
+            return 0;
+        }
+        if (midiChannelBinding.deviceSelection === MidiDeviceSelection.DeviceNone as number) {
+            return 1;
+        }
+        if (midiChannelBinding.midiDevices.length === 0) {
+            return 0;
+        }
+        let selectedDevice = midiChannelBinding.midiDevices[0];
+
+        let ix = 2;
+        for (let midiDevice of model.jackConfiguration.get().inputMidiDevices) {
+            if (midiDevice.name === selectedDevice) {
+                return ix;
+            }
+            ++ix;
+        }
+        return 0; // any.
+    }
+
+    const [currentDeviceSelect, setCurrentDeviceSelect] = useState(getDefaultDeviceSelect())
+
+
+    const handleDeviceSelecChange = (event: SelectChangeEvent) => {
+        setCurrentDeviceSelect(parseInt(event.target.value));
+    };
+    const handleChannelChange = (event: SelectChangeEvent) => {
+        setCurrentChannel(parseInt(event.target.value));
+    };
+
+    return (
+        <DialogEx tag="midiChannelBinding" onClose={handleClose} aria-labelledby="select-channels-title" open={open}
+            onEnterKey={()=>{}} fullWidth maxWidth="xs"
+        >
+            <DialogTitle id="simple-dialog-title">MIDI Channel Filters</DialogTitle>
+            <DialogContent>
+                <div style={{
+                    display: "grid", alignItems: "center", columnGap: 24, rowGap: 24,
+                    gridTemplateColumns: "1fr"
+                }}>
+                    <div >
+                        <Typography display="block" variant="caption">MIDI Devices</Typography>
+                        <Select variant='standard' value={currentDeviceSelect.toString()} fullWidth
+                            onChange={handleDeviceSelecChange} >
+                            {
+                                generateDeviceSelect()
+                            }
+                        </Select>
+                    </div>
+
+                    <div>
+                        <Typography display="block" variant="caption">Channels</Typography>
+                        <Select variant='standard' label="Channels" value={currentChannel.toString()} fullWidth
+                            onChange={handleChannelChange}>
+                            <MenuItem value={-1}>Omni</MenuItem>
+                            <MenuItem value={0}>Channel 1</MenuItem>
+                            <MenuItem value={1}>Channel 2</MenuItem>
+                            <MenuItem value={2}>Channel 3</MenuItem>
+                            <MenuItem value={3}>Channel 4</MenuItem>
+                            <MenuItem value={4}>Channel 5</MenuItem>
+                            <MenuItem value={5}>Channel 6</MenuItem>
+                            <MenuItem value={6}>Channel 7</MenuItem>
+                            <MenuItem value={7}>Channel 8</MenuItem>
+                            <MenuItem value={8}>Channel 9</MenuItem>
+                            <MenuItem value={9}>Channel 10</MenuItem>
+                            <MenuItem value={10}>Channel 11</MenuItem>
+                            <MenuItem value={11}>Channel 12</MenuItem>
+                            <MenuItem value={12}>Channel 13</MenuItem>
+                            <MenuItem value={13}>Channel 14</MenuItem>
+                            <MenuItem value={14}>Channel 15</MenuItem>
+                            <MenuItem value={15}>Channel 16</MenuItem>
+                        </Select>
+                    </div>
+
+                    <div style={{ display: "flex", flexFlow: "row nowrap", justifyContent: "center" }}>
+                        <FormControlLabel control={
+                            <Checkbox checked={allowProgramChanges}
+                                onChange={(event) => {
+                                    setAllowProgramChanges(event.target.checked);
+                                }}
+                            />
+                        } label="Allow Program Changes"
+                        />
+                        {false&&( // wait until the implementation stabilizes before exposing the help dialog.
+                            <IconButton
+                                onClick={() => { setHelpDialog(true); }}
+                                size="large">
+                                <InfoOutlinedIcon color='inherit'
+                                    className={classes.icon}
+                                />
+                            </IconButton>
+                        )}
+                    </div>
+
+                </div>
+
+            </DialogContent>
+            <DialogActions>
+                <Button onClick={handleClose} variant="dialogSecondary" >
+                    Cancel
+                </Button>
+                <Button onClick={handleOk} variant="dialogPrimary"   >
+                    OK
+                </Button>
+            </DialogActions>
+
+            <ChannelBindingHelpDialog open={helpDialog} onClose={()=>setHelpDialog(false)}
+            />
+        </DialogEx>
+    );
+}
+
+export default MidiChannelBindingDialog;
@@ -19,6 +19,7 @@

 import { PiPedalArgumentError } from './PiPedalError';
 import MidiBinding from './MidiBinding';
+import MidiChannelBinding from './MidiChannelBinding';


 const SPLIT_PEDALBOARD_ITEM_URI = "uri://two-play/pipedal/pedalboard#Split";
@@ -64,6 +65,12 @@ export class PedalboardItem implements Deserializable<PedalboardItem> {
        this.pluginName = input.pluginName;
        this.isEnabled = input.isEnabled;
        this.midiBindings = MidiBinding.deserialize_array(input.midiBindings);
+        if (input.midiChannelBinding)
+        {
+            this.midiChannelBinding = input.midiChannelBinding;
+        } else {
+            this.midiChannelBinding = null;
+        }

        this.controlValues = ControlValue.deserializeArray(input.controlValues);
        this.vstState = input.vstState ?? "";
@@ -197,6 +204,7 @@ export class PedalboardItem implements Deserializable<PedalboardItem> {
    pluginName?: string;
    controlValues: ControlValue[] = ControlValue.EmptyArray;
    midiBindings: MidiBinding[] = [];
+    midiChannelBinding: MidiChannelBinding | null = null;
    vstState: string = "";
    stateUpdateCount: number = 0;
    lv2State: [boolean,any] = [false,{}];
@@ -52,7 +52,7 @@ export const StandardItemSize = { width: 80, height: 140 }



-const styles = (theme: Theme) => createStyles({
+export const pluginControlStyles = (theme: Theme) => createStyles({
    frame: {
        position: "relative",
        margin: "12px"
@@ -90,13 +90,13 @@ const styles = (theme: Theme) => createStyles({
        flex: "1 1 1", display: "flex",flexFlow: "column nowrap",alignContent: "center",justifyContent: "center"
    },
    editSection: {
-        flex: "0 0 0", position: "relative", width: 60, height: 28,minHeight: 28
+        flex: "0 0 0", display: "flex", flexFlow: "column nowrap", justifyContent: "center",position: "relative", width: 60, height: 28,minHeight: 28
    }

 });


-export interface PluginControlProps extends WithStyles<typeof styles> {
+export interface PluginControlProps extends WithStyles<typeof pluginControlStyles> {
    uiControl?: UiControl;
    instanceId: number;
    value: number;
@@ -110,7 +110,7 @@ type PluginControlState = {
 };

 const PluginControl =
-    withStyles(styles, { withTheme: true })(
+    withStyles(pluginControlStyles, { withTheme: true })(
        class extends Component<PluginControlProps, PluginControlState> {

            frameRef: React.RefObject<HTMLDivElement>;
@@ -802,8 +802,8 @@ const PluginControl =
                            {(!(isSelect || isOnOffSwitch || isTrigger)) &&
                                (
                                    (isAbSwitch) ? (
-                                        <Typography variant="caption" display="block" noWrap style={{
-                                            width: "100%", textAlign: "center"
+                                        <Typography variant="caption" display="block" textAlign="center" noWrap style={{
+                                            width: "100%"
                                        }}> {switchText} </Typography>
                                    ) : (
                                        <div>
@@ -41,6 +41,8 @@ import PluginOutputControl from './PluginOutputControl';
 import Units from './Units';
 import ToobFrequencyResponseView from './ToobFrequencyResponseView';
 import Tooltip from '@mui/material/Tooltip';
+import MidiChannelBindingControl from './MidiChannelBindingControl';
+import MidiChannelBinding from './MidiChannelBinding';


 export const StandardItemSize = { width: 80, height: 110 };
@@ -90,35 +92,57 @@ const styles = (theme: Theme) => createStyles({
        paddingTop: "8px",
        paddingBottom: "0px",
        height: "100%",
+        overflowX: "hidden",
+        overflowY: "hidden"
+    },
+    frameScrollLandscape: {
+        display: "block",
+        position: "absolute",
+        left: 0, top: 0, right: 0, bottom:0,
+        flexDirection: "row",
+        flexWrap: "nowrap",
+        paddingTop: "0px",
+        paddingBottom: "0px",
        overflowX: "auto",
+        overflowY: "hidden"
+    },
+    frameScrollPortrait: {
+        display: "block",
+        position: "absolute",
+        left: 0, top: 0, right: 0, bottom:0,
+        flexDirection: "row",
+        flexWrap: "nowrap",
+        paddingTop: "0px",
+        paddingBottom: "0px",
+        overflowX: "hidden",
        overflowY: "auto"
    },
    vuMeterL: {
-        position: "fixed",
+        position: "absolute",
+        left: 0, top: 0,
        paddingLeft: 6,
        paddingRight: 4,
-        paddingBottom: 24,
-        left: 0,
+        paddingBottom: 12, // cover bottom line of a portgroup in landscape.
        background: theme.mainBackground,
        zIndex: 3

    },
    vuMeterR: {
-        position: "fixed",
-        right: 0,
-        marginRight: 22,
+        position: "absolute",
+        right: 0, top: 0,
+        marginRight: 20, // has to potentially clear a scrollbar.
        paddingLeft: 4,
-        paddingBottom: 24,
+        paddingBottom: 12,
        background: theme.mainBackground,
        zIndex: 3

    },
    vuMeterRLandscape: {
-        position: "fixed",
-        right: 0,
-        paddingRight: 22,
+        position: "absolute",
+        right: 0, top: 0,
+        paddingRight: 6,
        paddingLeft: 12,
-        paddingBottom: 24,
+        paddingBottom: 12, // cover bottom line of a portgroup in landscape.
        background: theme.mainBackground,
        zIndex: 3

@@ -126,21 +150,28 @@ const styles = (theme: Theme) => createStyles({

    normalGrid: {
        position: "relative",
-        paddingLeft: 25,
-        paddingRight: 34,
+        paddingLeft: 30,
+        paddingRight: 30,
+        paddingTop: 8,
        flex: "1 1 auto",
        display: "flex", flexDirection: "row", flexWrap: "wrap",
        justifyContent: "flex-start", alignItems: "flex_start",
-        rowGap: 10
+        rowGap: 14,
+        height: "fit-content"
+


    },
    landscapeGrid: {
-        paddingLeft: 40,
-        // marginRight: 40, : bug in chrome layout engine wrt/ right margin/padding. See the spacer div added after all controls in render() with provides the same effect.
+        paddingLeft: 40, paddingRight: 40, paddingTop: 8,
+        // marginRight: 40, : bug in chrome layout engine wrt/ right margin/padding. 
+        // See the spacer div added after all controls in render() with provides the same effect.
        display: "flex", flexDirection: "row", flexWrap: "nowrap",
-        justifyContent: "flex-start", alignItems: "flex_start",
-        flex: "0 0 auto"
+        justifyContent: "flex-start", alignItems: "flex-start",
+        overflowX: "hidden",
+        overflowY: "hidden",
+        flex: "0 0 auto",
+        width: "fit-content"
    },
    portgroupControlPadding: {
        flex: "0 0 auto",
@@ -198,10 +229,12 @@ const styles = (theme: Theme) => createStyles({
        border: "2pt #AAA solid",
        borderRadius: 8,
        elevation: 12,
-        display: "flex",
+        display: "inline-flex",
        textOverflow: "ellipsis",
        flexDirection: "row", flexWrap: "nowrap",
-        flex: "0 0 auto"
+        flex: "0 0 auto", 
+        width: "fit-content",
+        minWidth: "max-content"
    },
    portGroupTitle: {
        position: "absolute",
@@ -219,6 +252,13 @@ const styles = (theme: Theme) => createStyles({
        flexDirection: "row", flexWrap: "wrap",
        paddingTop: 6,
        paddingBottom: 8
+    },
+    portGroupControlsLandscape: {
+        display: "flex",
+        flexFlow: "row nowrap",
+        width: "fit-content",
+        paddingTop: 6,
+        paddingBottom: 8
    }


@@ -600,7 +640,8 @@ const PluginControlView =
                                        <Typography noWrap variant="caption" >{controlGroup.name}</Typography>
                                    </Tooltip>
                                </div>
-                                <div className={classes.portGroupControls} >
+                                <div className={
+                                    this.state.landscapeGrid ? classes.portGroupControlsLandscape : classes.portGroupControls} >
                                    {
                                        controls
                                    }
@@ -626,6 +667,20 @@ const PluginControlView =
            static endPluginInfo: UiPlugin =
                makeIoPluginInfo("Output", Pedalboard.END_PEDALBOARD_ITEM_URI);

+            midiBindingControl(pedalboardItem: PedalboardItem): ReactNode {
+                if (!pedalboardItem.midiChannelBinding) {
+                    return false;
+                }
+                return (
+                    <MidiChannelBindingControl key="channelBindingCtl" midiChannelBinding={pedalboardItem.midiChannelBinding}
+                        onChange={(result)=> { 
+
+                        }}
+                    />
+                )
+            }
+
+

            render(): ReactNode {
                this.controlKeyIndex = 0;
@@ -663,6 +718,7 @@ const PluginControlView =


                let gridClass = this.state.landscapeGrid ? classes.landscapeGrid : classes.normalGrid;
+                let scrollClass = this.state.landscapeGrid ? classes.frameScrollLandscape : classes.frameScrollPortrait;
                let vuMeterRClass = this.state.landscapeGrid ? classes.vuMeterRLandscape : classes.vuMeterR;
                let controlNodes: ControlNodes;

@@ -675,6 +731,16 @@ const PluginControlView =

                let nodes = this.controlNodesToNodes(controlNodes);

+                if (plugin.has_midi_input && !pedalboardItem.midiChannelBinding)
+                {
+                    pedalboardItem.midiChannelBinding = MidiChannelBinding.CreateMissingValue();
+                
+                }
+                if (pedalboardItem.midiChannelBinding) {
+                    nodes.push(this.midiBindingControl(pedalboardItem));
+                }
+
+
                return (
                    <div className={classes.frame}>
                        <div className={classes.vuMeterL}>
@@ -683,16 +749,19 @@ const PluginControlView =
                        <div className={vuMeterRClass}>
                            <VuMeter displayText={true} display="output" instanceId={pedalboardItem.instanceId} />
                        </div>
-                        <div className={gridClass}  >
-                            {
-                                nodes
-                            }
-                            <div style={{ flex: "0 0 40px", width: 40, height: 40 }} />
-                            {
-                                (!this.state.landscapeGrid) && (
-                                    <div style={{ flex: "0 1 100%", width: "0px", height: 40 }} />
-                                )
-                            }
+                        <div className={scrollClass}>
+                            <div className={gridClass}  >
+                                {
+                                    nodes
+                                }
+                                {/* Extra space to allow scrolling right to the end in lascape especially */}
+                                <div style={{ flex: "0 0 40px", width: 40, height: 40 }} />
+                                {
+                                    (!this.state.landscapeGrid) && (
+                                        <div style={{ flex: "0 1 100%", width: "0px", height: 40 }} />
+                                    )
+                                }
+                            </div>
                        </div>
                        {this.state.showFileDialog && (

@@ -65,7 +65,6 @@ import { ReactComponent as FxEmptyIcon } from './svg/fx_empty.svg';
 import { ReactComponent as FxTerminalIcon } from './svg/fx_terminal.svg';

 import {isDarkMode} from './DarkMode';
-import { Color } from '@mui/material';



@@ -1862,8 +1862,9 @@ public:
                        VuUpdate v;
                        v.instanceId_ = instanceId;
                        // Display mono VUs if a stereo device is being fed identical L/R inputs.
-                        v.isStereoInput_ = effect->GetNumberOfInputAudioPorts() != 1 && effect->GetAudioInputBuffer(0) != effect->GetAudioInputBuffer(1);
-                        v.isStereoOutput_ = effect->GetNumberOfOutputAudioPorts() != 1;
+                        v.isStereoInput_ = effect->GetNumberOfInputAudioBuffers() >= 2 
+                            && effect->GetAudioInputBuffer(0) != effect->GetAudioInputBuffer(1);
+                        v.isStereoOutput_ = effect->GetNumberOfOutputAudioBuffers() >= 2;

                        vuConfig->vuUpdateWorkingData.push_back(v);
                        vuConfig->vuUpdateResponseData.push_back(v);
@@ -41,7 +41,7 @@ namespace macaron
    public:
        static std::string Encode(const std::vector<uint8_t> &data)
        {
-            return Encode(data.size(),&(data[0]));
+            return Encode(data.size(),data.data());
        }
        static std::string Encode(size_t size, const uint8_t *data)
        {
@@ -112,6 +112,9 @@ namespace macaron
            if (in_len % 4 != 0)
                throw std::invalid_argument("Input data size is not a multiple of 4");

+            if (in_len < 4) {
+                return std::vector<uint8_t>();
+            }
            size_t out_len = in_len / 4 * 3;
            if (input[in_len - 1] == '=')
                out_len--;
@@ -49,8 +49,11 @@ namespace pipedal {
        virtual void SetBypass(bool enable)  = 0;
        virtual float GetOutputControlValue(int controlIndex) const = 0;

-        virtual int GetNumberOfInputAudioPorts() const = 0;
-        virtual int GetNumberOfOutputAudioPorts() const = 0;
+        virtual int GetNumberOfInputAudioPorts() const = 0; // as declared
+        virtual int GetNumberOfOutputAudioPorts() const = 0; // as declared.
+
+        virtual int GetNumberOfInputAudioBuffers() const = 0; // may be different if plugin has zero inputs.
+        virtual int GetNumberOfOutputAudioBuffers() const = 0; // may be different if plugin has zero inputs.
        virtual float *GetAudioInputBuffer(int index) const = 0;
        virtual float *GetAudioOutputBuffer(int index) const = 0;
        virtual void ResetAtomBuffers() = 0;
@@ -414,12 +414,12 @@ void Lv2Effect::SetAudioInputBuffer(int index, float *buffer)

 void Lv2Effect::SetAudioInputBuffer(float *left)
 {
-    if (GetNumberOfInputAudioPorts() > 1)
+    if (GetNumberOfInputAudioBuffers() > 1)
    {
        SetAudioInputBuffer(0, left);
        SetAudioInputBuffer(1, left);
    }
-    else if (GetNumberOfInputAudioPorts() != 0) /// yyx MIXING!
+    else if (GetNumberOfInputAudioBuffers() != 0) 
    {
        SetAudioInputBuffer(0, left);
    }
@@ -427,11 +427,11 @@ void Lv2Effect::SetAudioInputBuffer(float *left)

 void Lv2Effect::SetAudioInputBuffers(float *left, float *right)
 {
-    if (GetNumberOfInputAudioPorts() == 1)
+    if (GetNumberOfInputAudioBuffers() == 1)
    {
        SetAudioInputBuffer(0, left);
    }
-    else if (GetNumberOfInputAudioPorts() > 1)
+    else if (GetNumberOfInputAudioBuffers() > 1)
    {
        SetAudioInputBuffer(0, left);
        SetAudioInputBuffer(1, right);
@@ -252,16 +252,22 @@ namespace pipedal
        virtual uint64_t GetInstanceId() const { return instanceId; }
        virtual int GetNumberOfInputAudioPorts() const { return inputAudioPortIndices.size(); }
        virtual int GetNumberOfOutputAudioPorts() const { return outputAudioPortIndices.size(); }
+
        virtual int GetNumberOfInputAtomPorts() const { return inputAtomPortIndices.size(); }
+
        virtual int GetNumberOfOutputAtomPorts() const { return outputAtomPortIndices.size(); }
        virtual int GetNumberOfMidiInputPorts() const { return inputMidiPortIndices.size(); }
        virtual int GetNumberOfMidiOutputPorts() const { return outputMidiPortIndices.size(); }



+        virtual int GetNumberOfInputAudioBuffers() const { return this->inputAudioBuffers.size(); }
+        virtual int GetNumberOfOutputAudioBuffers() const {return this->outputAudioBuffers.size(); }
+
        virtual void SetAudioInputBuffer(int index, float *buffer);
        virtual float *GetAudioInputBuffer(int index) const { return this->inputAudioBuffers[index]; }

+
        virtual void SetAudioInputBuffer(float *buffer);
        virtual void SetAudioInputBuffers(float *left, float *right);

@@ -136,11 +136,11 @@ std::vector<float *> Lv2Pedalboard::PrepareItems(

                    if (inputBuffers.size() == 1)
                    {
-                        if (pLv2Effect->GetNumberOfInputAudioPorts() == 1)
+                        if (pLv2Effect->GetNumberOfInputAudioBuffers() == 1)
                        {
                            pLv2Effect->SetAudioInputBuffer(0, inputBuffers[0]);
                        }
-                        else
+                        else if (pLv2Effect->GetNumberOfInputAudioBuffers() >= 2)
                        {
                            pLv2Effect->SetAudioInputBuffer(0, inputBuffers[0]);
                            pLv2Effect->SetAudioInputBuffer(1, inputBuffers[0]);
@@ -148,13 +148,13 @@ std::vector<float *> Lv2Pedalboard::PrepareItems(
                    }
                    else
                    {
-                        if (pLv2Effect->GetNumberOfInputAudioPorts() == 1)
+                        if (pLv2Effect->GetNumberOfInputAudioBuffers() == 1)
                        {
                            pLv2Effect->SetAudioInputBuffer(0, inputBuffers[0]);

                            auto inputBuffer = inputBuffers[0];
                        }
-                        else
+                        else if (pLv2Effect->GetNumberOfInputAudioBuffers() >= 2)
                        {
                            pLv2Effect->SetAudioInputBuffer(0, inputBuffers[0]);
                            pLv2Effect->SetAudioInputBuffer(1, inputBuffers[1]);
@@ -178,37 +178,15 @@ std::vector<float *> Lv2Pedalboard::PrepareItems(

                std::vector<float *> effectOutput;

-#ifdef RECYCLE_AUDIO_BUFFERS
-                // can't do this anymore if we're going to do pop-less bypbass.
-                if (pEffect->GetNumberOfOutputAudioPorts() == 1)
-                {
-                    float *pLeft = inputBuffers[0];
-                    effectOutput.push_back(pLeft);
-                }
-                else
-                {
-                    if (inputBuffers.size() == 1)
-                    {
-                        effectOutput.push_back(inputBuffers[0]);
-                        effectOutput.push_back(CreateNewAudioBuffer());
-                    }
-                    else
-                    {
-                        effectOutput.push_back(inputBuffers[0]);
-                        effectOutput.push_back(inputBuffers[1]);
-                    }
-                }
-#else
-                if (pEffect->GetNumberOfOutputAudioPorts() == 1)
+                if (pEffect->GetNumberOfOutputAudioBuffers() == 1)
                {
                    effectOutput.push_back(CreateNewAudioBuffer());
                }
-                else
+                else if (pEffect->GetNumberOfOutputAudioBuffers() >= 2)
                {
                    effectOutput.push_back(CreateNewAudioBuffer());
                    effectOutput.push_back(CreateNewAudioBuffer());
                }
-#endif
                for (size_t i = 0; i < effectOutput.size(); ++i) 
                {
                    pEffect->SetAudioOutputBuffer(i, effectOutput[i]);
@@ -475,21 +453,21 @@ void Lv2Pedalboard::ComputeVus(RealtimeVuBuffers *vuConfiguration, uint32_t samp
        {
            auto effect = this->realtimeEffects[index];

-            if (effect->GetNumberOfInputAudioPorts() == 1)
+            if (effect->GetNumberOfInputAudioBuffers() == 1)
            {
                pUpdate->AccumulateInputs(effect->GetAudioInputBuffer(0), samples);
            }
-            else
+            else if (effect->GetNumberOfInputAudioBuffers() >= 2)
            {
                pUpdate->AccumulateInputs(
                    effect->GetAudioInputBuffer(0),
                    effect->GetAudioInputBuffer(1), samples);
            }
-            if (effect->GetNumberOfOutputAudioPorts() == 1)
+            if (effect->GetNumberOfOutputAudioBuffers() == 1)
            {
                pUpdate->AccumulateOutputs(effect->GetAudioOutputBuffer(0), samples);
            }
-            else
+            else if (effect->GetNumberOfOutputAudioBuffers() >= 2)
            {
                pUpdate->AccumulateOutputs(
                    effect->GetAudioOutputBuffer(0),
@@ -17,12 +17,41 @@
 // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

-#include "pch.h"
 #include "MidiBinding.hpp"
+#include "MapFeature.hpp"


 using namespace pipedal;

+MidiChannelBinding MidiChannelBinding::DefaultForMissingValue()
+{
+    MidiChannelBinding result {};
+
+    return result;
+}
+
+
+void MidiChannelBinding::Prepare(MapFeature &mapFeature)
+{
+    midiDeviceUrids.resize(0);
+    midiDeviceUrids.reserve(midiDevices_.size());
+
+    for (const auto&midiDevice: midiDevices_)
+    {
+        midiDeviceUrids.push_back(mapFeature.GetUrid(midiDevice.c_str()));
+    }
+}
+
+
+JSON_MAP_BEGIN(MidiChannelBinding)
+    JSON_MAP_REFERENCE(MidiChannelBinding,deviceSelection)
+    JSON_MAP_REFERENCE(MidiChannelBinding,midiDevices)
+    JSON_MAP_REFERENCE(MidiChannelBinding,channel)
+    JSON_MAP_REFERENCE(MidiChannelBinding,acceptProgramChanges)
+    JSON_MAP_REFERENCE(MidiChannelBinding,acceptCommonMessages)
+JSON_MAP_END()
+
+
 JSON_MAP_BEGIN(MidiBinding)
    JSON_MAP_REFERENCE(MidiBinding,channel)
    JSON_MAP_REFERENCE(MidiBinding,symbol)
@@ -20,10 +20,16 @@
 #pragma once

 #include "json.hpp"
+#include <cstdint>
+#include <string>
+#include <vector>
+#include <lv2/urid/urid.h>
+


 namespace pipedal {

+class MapFeature;

 #define GETTER_SETTER_REF(name) \
    const decltype(name##_)& name() const { return name##_;} \
@@ -33,6 +39,9 @@ namespace pipedal {
    decltype(name##_)& name()  { return name##_;}  \
    const decltype(name##_)& name() const  { return name##_;} 

+    //void name(decltype(const name##_) &value) { name##_ =  value; } 
+    //void name(decltype(const name##_) &&value) { name##_ =  std::move(value); }
+


 #define GETTER_SETTER(name) \
@@ -102,6 +111,85 @@ public:

 };

+
+enum class MidiDeviceSelection {
+    DeviceAny = 0,
+    DeviceNone = 1,
+    DeviceList = 2
+};
+
+class MidiChannelBinding {
+public:
+    static constexpr std::int32_t CHANNEL_OMNI = -1;
+private:
+    int32_t deviceSelection_ = (int32_t)(MidiDeviceSelection::DeviceAny);
+
+    std::vector<std::string> midiDevices_;
+
+    std::vector<LV2_URID> midiDeviceUrids;
+
+    std::int32_t channel_ = CHANNEL_OMNI;
+    bool acceptProgramChanges_ = true;
+    bool acceptCommonMessages_ = true;
+public:
+    MidiDeviceSelection deviceSelection() const { return (MidiDeviceSelection)deviceSelection_; }
+    void deviceSelection(MidiDeviceSelection value) { deviceSelection_ = (int32_t)value; }
+    GETTER_SETTER_VEC(midiDevices);
+    GETTER_SETTER(channel);
+    GETTER_SETTER(acceptProgramChanges);
+    GETTER_SETTER(acceptCommonMessages);
+
+    void Prepare(MapFeature &mapFeature);
+
+    static MidiChannelBinding DefaultForMissingValue();
+
+    bool WantsMidiMessage(uint8_t midi_cc0,uint8_t midi_cc1, uint8_t midi_cc2);
+    bool WantProgramChange(uint8_t midi_cc0,uint8_t midi_cc1);
+
+    // must call Prepare first.
+    bool WantsDevice(LV2_URID deviceUrid);
+
+
+    DECLARE_JSON_MAP(MidiChannelBinding);
+
+};
+///////////////////////////////////////
+
+inline bool MidiChannelBinding::WantsMidiMessage(uint8_t midi_cc0,uint8_t midi_cc1, uint8_t midi_cc2)
+{
+    if (midi_cc0 < 0xF0)
+    {
+        if (channel_ < 0) return true;
+
+        return midi_cc0 & 0x0F == channel_;
+    } else {
+        return acceptCommonMessages_;
+    }
+}
+
+inline bool MidiChannelBinding::WantProgramChange(uint8_t midi_cc0,uint8_t midi_cc1)
+{
+    if (!acceptProgramChanges_)
+    {
+        return false;
+    }
+    if (channel_ < 0) return true;
+    return midi_cc0 & 0x0F == channel_;
+}
+
+inline bool MidiChannelBinding::WantsDevice(LV2_URID deviceUrid)
+{
+    if (this->midiDeviceUrids.size() == 0) return true;
+    for (LV2_URID urid: midiDeviceUrids)
+    {
+        if (urid == deviceUrid) return true;
+    }
+    return false;
+}
+
+//////////////////////////////////////////
+
+
 #undef GETTER_SETTER_REF
 #undef GETTER_SETTER_VEC
 #undef GETTER_SETTER
@@ -92,6 +92,7 @@ public:
    std::vector<PedalboardItem> topChain_;
    std::vector<PedalboardItem> bottomChain_;
    std::vector<MidiBinding> midiBindings_;
+    std::optional<MidiChannelBinding> midiChannelBinding_;
    std::string vstState_;
    uint32_t stateUpdateCount_ = 0;
    Lv2PluginState lv2State_;
@@ -122,6 +123,7 @@ public:
    GETTER_SETTER_VEC(topChain)
    GETTER_SETTER_VEC(bottomChain)
    GETTER_SETTER_VEC(midiBindings)
+    GETTER_SETTER_REF(midiChannelBinding)
    GETTER_SETTER(stateUpdateCount)
    GETTER_SETTER_REF(lv2State)
    Lv2PluginState&lv2State() { return lv2State_; } // non-const version.
@@ -1876,6 +1876,18 @@ void PiPedalModel::UpdateDefaults(PedalboardItem *pedalboardItem, std::unordered
    }
    if (pPlugin)
    {
+        if (pPlugin->hasMidiInput())
+        {
+            if (!pedalboardItem->midiChannelBinding())
+            {
+                pedalboardItem->midiChannelBinding(MidiChannelBinding::DefaultForMissingValue());
+            }
+        } else {
+            if (pedalboardItem->midiChannelBinding())
+            {
+                pedalboardItem->midiChannelBinding(std::optional<MidiChannelBinding>()); // clear it.
+            }
+        }
        for (size_t i = 0; i < pPlugin->ports().size(); ++i)
        {
            auto port = pPlugin->ports()[i];
@@ -495,6 +495,10 @@ void PluginHost::Load(const char *lv2Path)
            {
                Lv2Log::debug("Plugin %s (%s) skipped. No audio i/o.", plugin->name().c_str(), plugin->uri().c_str());
                
+            } else if (info.audio_inputs() == 0) 
+            {
+                // temporarily disable this feature.
+                Lv2Log::debug("Plugin %s (%s) skipped. No inputs.", plugin->name().c_str(), plugin->uri().c_str());
            }
 #elif SUPPORT_MIDI
            if (info.audio_inputs() == 0 && !info.has_midi_input())
@@ -520,9 +524,6 @@ void PluginHost::Load(const char *lv2Path)
                if (info.audio_inputs() == 0) {
                    Lv2Log::debug("************* ZERO INPUTS: %s (%s) skipped. No audio outputs.", plugin->name().c_str(), plugin->uri().c_str());
                }
-                if (info.audio_outputs() == 0) {
-                    Lv2Log::debug("************* ZERO OUTPUTS: %s (%s) skipped. No audio outputs.", plugin->name().c_str(), plugin->uri().c_str());
-                }
                ui_plugins_.push_back(std::move(info));
            }
        }
@@ -432,6 +432,7 @@ namespace pipedal
                    return true;
                }
            }
+            return false;
        }
        bool hasMidiOutput() const
        {
@@ -381,10 +381,15 @@ namespace pipedal
        {
            return (int)this->inputs.size();
        }
+        virtual int GetNumberOfInputAudioBuffers() const { return this->inputs.size(); }
+
        virtual float *GetAudioInputBuffer(int index) const
        {
            return inputs[index];
        }
+
+        virtual int GetNumberOfOutputAudioBuffers() const {return this->outputBuffers.size(); }
+
        virtual float *GetAudioOutputBuffer(int index) const
        {
            return this->outputBuffers[index];
@@ -199,7 +199,7 @@ const void *StateInterface::StateRetrieveFunction(
    *size = entry.value_.size();
    *type = map.GetUrid(entry.atomType_.c_str());
    *flags = entry.flags_;
-    return (void*)&entry.value_[0];
+    return entry.value_.data();

 }

@@ -126,8 +126,21 @@ namespace pipedal
 		{
 			return info.pluginInfo_.audio_outputs();
 		}
+		
+        virtual int GetNumberOfInputAudioBuffers() const { return buffers.inputs.size(); }
+        virtual int GetNumberOfOutputAudioPorts() const {return buffers.outputs.size(); }
+
 		virtual float *GetAudioInputBuffer(int index) const { return buffers.inputs[index]; }
 		virtual float *GetAudioOutputBuffer(int index) const { return buffers.outputs[index]; }
+
+		virtual int GetNumberOfInputAudioBuffers() const {
+			return buffers.inputs.size();
+		}
+		virtual int GetNumberOfInputAudioBuffers() const {
+			return buffers.outputs.size();
+		}
+
+
 		virtual void ResetAtomBuffers() {}
 		virtual void RequestParameter(LV2_URID uridUri) {}					// no vst equivalent.
 		virtual void GatherPatchProperties(RealtimePatchPropertyRequest *pRequest) {} // no vst equivalent.