diff --git a/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.5 b/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.5
new file mode 100644
index 0000000..8abc92b
Binary files /dev/null and b/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.5 differ
diff --git a/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.6 b/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.6
index 8abc92b..38cf172 100644
Binary files a/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.6 and b/lv2/aarch64/ToobAmp.lv2/ToobAmp.so.0.1.6 differ
diff --git a/lv2/aarch64/ToobAmp.lv2/ToobChorus.ttl b/lv2/aarch64/ToobAmp.lv2/ToobChorus.ttl
new file mode 100644
index 0000000..c3247ea
--- /dev/null
+++ b/lv2/aarch64/ToobAmp.lv2/ToobChorus.ttl
@@ -0,0 +1,92 @@
+@prefix doap:  <http://usefulinc.com/ns/doap#> .
+@prefix lv2:   <http://lv2plug.in/ns/lv2core#> .
+@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix units: <http://lv2plug.in/ns/extensions/units#> .
+@prefix urid:    <http://lv2plug.in/ns/ext/urid#> .
+@prefix atom:   <http://lv2plug.in/ns/ext/atom#> .
+@prefix midi:  <http://lv2plug.in/ns/ext/midi#> .
+@prefix epp:     <http://lv2plug.in/ns/ext/port-props#> .
+@prefix uiext:   <http://lv2plug.in/ns/extensions/ui#> .
+@prefix idpy:  <http://harrisonconsoles.com/lv2/inlinedisplay#> .
+@prefix foaf:  <http://xmlns.com/foaf/0.1/> .
+@prefix mod:   <http://moddevices.com/ns/mod#> .
+@prefix param:   <http://lv2plug.in/ns/ext/parameters#> .
+@prefix work:  <http://lv2plug.in/ns/ext/worker#> .
+@prefix pg:      <http://lv2plug.in/ns/ext/port-groups#> .
+
+@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
+@prefix patch: <http://lv2plug.in/ns/ext/patch#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix state: <http://lv2plug.in/ns/ext/state#> .
+@prefix urid: <http://lv2plug.in/ns/ext/urid#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix toobChorus: <http://two-play.com/plugins/toob-chorus#> .
+
+
+<http://two-play.com/rerdavies#me>
+	a foaf:Person ;
+	foaf:name "Robin Davies" ;
+	foaf:mbox <mailto:rerdavies@gmail.com> ;
+	foaf:homepage <http://two-play.com/> .
+
+<http://two-play.com/plugins/toob-chorus>
+        a lv2:Plugin ,
+                lv2:ChorusPlugin ;
+                doap:name "TooB CE-2 Chorus" ,
+                "TooB CE-2 Chorus"@en-gb 
+                ;
+        doap:license <https://two-play.com/TooB/licenses/isc> ;
+        doap:maintainer <http://two-play.com/rerdavies#me> ;
+         lv2:minorVersion 0 ;
+        lv2:microVersion 1 ;
+        rdfs:comment """
+Emulation of Boss CE-2 Chorus.
+
+""" ;
+
+        mod:brand "TooB";
+        mod:label "CE-2 Chorus";
+        lv2:optionalFeature lv2:hardRTCapable;
+
+        lv2:port
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index  0;
+                lv2:symbol "rate" ;
+                lv2:name "Rate";
+                lv2:default 0.5 ;
+                lv2:minimum 0.0;
+                lv2:maximum 1.0;
+        ],  
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 1 ;
+                lv2:symbol "depth" ;
+                lv2:name "Depth";
+
+                lv2:default 0.5 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 1.0 ;
+        ],  
+        [
+                a lv2:AudioPort ,
+                        lv2:InputPort ;
+                lv2:index 2 ;
+                lv2:symbol "in" ;
+                lv2:name "In"
+        ],
+        [
+                a lv2:AudioPort ,
+                        lv2:OutputPort ;
+                lv2:index 3 ;
+                lv2:symbol "out" ;
+                lv2:name "Out"
+        ]
+        .
+
+
diff --git a/lv2/aarch64/ToobAmp.lv2/ToobDelay.ttl b/lv2/aarch64/ToobAmp.lv2/ToobDelay.ttl
new file mode 100644
index 0000000..b38a479
--- /dev/null
+++ b/lv2/aarch64/ToobAmp.lv2/ToobDelay.ttl
@@ -0,0 +1,109 @@
+@prefix doap:  <http://usefulinc.com/ns/doap#> .
+@prefix lv2:   <http://lv2plug.in/ns/lv2core#> .
+@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix units: <http://lv2plug.in/ns/extensions/units#> .
+@prefix urid:    <http://lv2plug.in/ns/ext/urid#> .
+@prefix atom:   <http://lv2plug.in/ns/ext/atom#> .
+@prefix midi:  <http://lv2plug.in/ns/ext/midi#> .
+@prefix epp:     <http://lv2plug.in/ns/ext/port-props#> .
+@prefix uiext:   <http://lv2plug.in/ns/extensions/ui#> .
+@prefix idpy:  <http://harrisonconsoles.com/lv2/inlinedisplay#> .
+@prefix foaf:  <http://xmlns.com/foaf/0.1/> .
+@prefix mod:   <http://moddevices.com/ns/mod#> .
+@prefix param:   <http://lv2plug.in/ns/ext/parameters#> .
+@prefix work:  <http://lv2plug.in/ns/ext/worker#> .
+@prefix pg:      <http://lv2plug.in/ns/ext/port-groups#> .
+
+@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
+@prefix patch: <http://lv2plug.in/ns/ext/patch#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix state: <http://lv2plug.in/ns/ext/state#> .
+@prefix urid: <http://lv2plug.in/ns/ext/urid#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix toobDelay: <http://two-play.com/plugins/toob-delay#> .
+
+
+<http://two-play.com/rerdavies#me>
+	a foaf:Person ;
+	foaf:name "Robin Davies" ;
+	foaf:mbox <mailto:rerdavies@gmail.com> ;
+	foaf:homepage <http://two-play.com/> .
+
+<http://two-play.com/plugins/toob-delay>
+        a lv2:Plugin ,
+                lv2:DelayPlugin ;
+                doap:name "TooB Delay" ,
+                "TooB Delay"@en-gb 
+                ;
+        doap:license <https://two-play.com/TooB/licenses/isc> ;
+        doap:maintainer <http://two-play.com/rerdavies#me> ;
+         lv2:minorVersion 0 ;
+        lv2:microVersion 13 ;
+        rdfs:comment """
+Digital delay.
+
+""" ;
+
+        mod:brand "TooB";
+        mod:label "Delay";
+        lv2:optionalFeature lv2:hardRTCapable;
+
+        lv2:port
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index  0;
+                lv2:symbol "delay" ;
+                lv2:name "Delay";
+                lv2:default 340 ;
+                lv2:minimum 5;
+                lv2:maximum 1200;
+                units:unit units:ms;
+                lv2:portProperty <http://lv2plug.in/ns/ext/port-props#logarithmic>;
+
+        ],  
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 1 ;
+                lv2:symbol "level" ;
+                lv2:name "Level";
+
+                lv2:default 27.0 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 100.0 ;
+                units:unit units:pc;
+        ], [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 2 ;
+                lv2:symbol "feedback" ;
+                lv2:name "Feedback";
+
+
+                lv2:default 39.0 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 100.0 ;
+                units:unit units:pc;
+        ],  
+        [
+                a lv2:AudioPort ,
+                        lv2:InputPort ;
+                lv2:index 3 ;
+                lv2:symbol "in" ;
+                lv2:name "In"
+        ],
+        [
+                a lv2:AudioPort ,
+                        lv2:OutputPort ;
+                lv2:index 4 ;
+                lv2:symbol "out" ;
+                lv2:name "Out"
+        ]
+        .
+
+
diff --git a/lv2/aarch64/ToobAmp.lv2/ToobML.ttl b/lv2/aarch64/ToobAmp.lv2/ToobML.ttl
index 50834a7..aded817 100644
--- a/lv2/aarch64/ToobAmp.lv2/ToobML.ttl
+++ b/lv2/aarch64/ToobAmp.lv2/ToobML.ttl
@@ -86,58 +86,9 @@ and uses model files from from the GuitarML Neural Pi project (https://github.co
                 units:unit units:db ;
                 rdf:comment "Input volume trim (pre-model)";
         ],  
-        [
-                a lv2:InputPort ,
-                lv2:ControlPort ;
-
-                lv2:index 1 ;
-                lv2:symbol "bass" ;
-                lv2:name "Bass";
-
-                pg:group toobml:filterGroup ;
-
-                lv2:default 0.5 ;
-                lv2:minimum 0.0 ;
-                lv2:maximum 1.0 ;
-
-                rdf:comment "Bass eq (pre-model)";
-        ], [
-                a lv2:InputPort ,
-                lv2:ControlPort ;
-
-                lv2:index 2 ;
-                lv2:symbol "mid" ;
-                lv2:name "Mid";
-
-                pg:group toobml:filterGroup ;
-
-                lv2:default 0.5 ;
-                lv2:minimum 0.0 ;
-                lv2:maximum 1.0 ;
-
-
-                rdf:comment "Mid eq (pre-model)";
-
-        ],  [
-                a lv2:InputPort ,
-                lv2:ControlPort ;
-
-                lv2:index 3 ;
-                lv2:symbol "treble" ;
-                lv2:name "Treble";
-
-                pg:group toobml:filterGroup ;
-
-                lv2:default 0.5 ;
-                lv2:minimum 0.0 ;
-                lv2:maximum 1.0 ;
-
-
-                rdf:comment "Treble eq (pre-model)";
-        ],  
         [
                 a lv2:InputPort, lv2:ControlPort ;
-                lv2:index 4 ;
+                lv2:index 1 ;
                 lv2:symbol "model" ;
                 lv2:name "Model" ;
                 lv2:default 0.0 ; 
@@ -282,7 +233,7 @@ and uses model files from from the GuitarML Neural Pi project (https://github.co
                 a lv2:InputPort ,
                 lv2:ControlPort ;
 
-                lv2:index 5  ;
+                lv2:index 2  ;
                 lv2:symbol "gain" ;
                 lv2:name "Gain";
                 lv2:default 3.0 ;
@@ -294,7 +245,7 @@ and uses model files from from the GuitarML Neural Pi project (https://github.co
                 a lv2:InputPort ,
                 lv2:ControlPort ;
 
-                lv2:index 6 ;
+                lv2:index 3 ;
                 lv2:symbol "master" ;
                 lv2:name "Master";
                 lv2:default 0.0 ;
@@ -304,16 +255,81 @@ and uses model files from from the GuitarML Neural Pi project (https://github.co
                 rdf:comment "Output volume trim (pot-model)";
         ],  
 
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 4 ;
+                lv2:symbol "bass" ;
+                lv2:name "Bass";
+
+                pg:group toobml:filterGroup ;
+
+                lv2:default 0.5 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 1.0 ;
+
+                rdf:comment "Bass eq (pre-model)";
+        ], [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 5 ;
+                lv2:symbol "mid" ;
+                lv2:name "Mid";
+
+                pg:group toobml:filterGroup ;
+
+                lv2:default 0.5 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 1.0 ;
+
+
+                rdf:comment "Mid eq (pre-model)";
+
+        ],  
+        [
+                a lv2:InputPort ,
+                lv2:ControlPort ;
+
+                lv2:index 6 ;
+                lv2:symbol "treble" ;
+                lv2:name "Treble";
+
+                pg:group toobml:filterGroup ;
+
+                lv2:default 0.5 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 1.0 ;
+
+
+                rdf:comment "Treble eq (pre-model)";
+        ],
+        [
+                a lv2:OutputPort ,
+                lv2:ControlPort ;
+
+                lv2:portProperty epp:notOnGUI;
+                lv2:index 7 ;
+                lv2:symbol "gainEnable" ;
+                lv2:name "GainEnable";
+
+                lv2:default 0.1 ;
+                lv2:minimum 0.0 ;
+                lv2:maximum 1.0 ;
+
+        ],
+
         [
                 a lv2:AudioPort ,
                         lv2:InputPort ;
-                lv2:index 7 ;
+                lv2:index 8 ;
                 lv2:symbol "in" ;
                 lv2:name "In"
         ], [
                 a lv2:AudioPort ,
                         lv2:OutputPort ;
-                lv2:index 8 ;
+                lv2:index 9 ;
                 lv2:symbol "out" ;
                 lv2:name "Out"
         ]
@@ -324,21 +340,22 @@ and uses model files from from the GuitarML Neural Pi project (https://github.co
                 atom:bufferType atom:Sequence ;
                 atom:supports patch:Message;
                 lv2:designation lv2:control ;
-                lv2:index 9 ;
+                lv2:index 10 ;
                 lv2:symbol "control" ;
                 lv2:name "Control" ;
                 rdfs:comment "Plugin to GUI communication" ;
-        ] , [
+        ] , 
+        [
                 a atom:AtomPort ,
                   lv2:OutputPort ;
                 atom:bufferType atom:Sequence ;
                 atom:supports patch:Message;
                 lv2:designation lv2:control ;
-                lv2:index 10 ;
+                lv2:index 11 ;
                 lv2:symbol "notify" ;
                 lv2:name "Notify" ;
                 rdfs:comment "Plugin to GUI communication" ;
-        ]        
+        ]
         .
 
 
diff --git a/lv2/aarch64/ToobAmp.lv2/manifest.ttl b/lv2/aarch64/ToobAmp.lv2/manifest.ttl
index 144ac30..e94dfc3 100644
--- a/lv2/aarch64/ToobAmp.lv2/manifest.ttl
+++ b/lv2/aarch64/ToobAmp.lv2/manifest.ttl
@@ -36,6 +36,14 @@
      lv2:binary <ToobAmp.so> ;
      rdfs:seeAlso <ToobFreeverb.ttl> .
 
+<http://two-play.com/plugins/toob-delay> a lv2:Plugin ;
+     lv2:binary <ToobAmp.so> ;
+     rdfs:seeAlso <ToobDelay.ttl> .
+
+<http://two-play.com/plugins/toob-chorus> a lv2:Plugin ;
+     lv2:binary <ToobAmp.so> ;
+     rdfs:seeAlso <ToobChorus.ttl> .
+
 
 
 
diff --git a/react/src/ToobMLView.tsx b/react/src/ToobMLView.tsx
index f0366ab..4500731 100644
--- a/react/src/ToobMLView.tsx
+++ b/react/src/ToobMLView.tsx
@@ -76,8 +76,8 @@ const ToobMLView =
             addGainEnabledSubscription(instanceId: number)
             {
                 this.removeGainEnabledSubscription();
-
-                this.monitorPortHandle = this.model.monitorPort(instanceId,"gainEnabled",0.1,
+                this.subscribedId = instanceId;
+                this.monitorPortHandle = this.model.monitorPort(instanceId,"gainEnable",0.1,
                     (value: number) => {
                         if (this.gainRef.current)
                         {
@@ -112,10 +112,10 @@ const ToobMLView =
                     ( <ToobFrequencyResponseView instanceId={this.props.instanceId} minDb={-20} maxDb={20} />)
                     );
 
-                let gainControl: React.ReactElement = controls[3] as React.ReactElement;
+                let gainControl: React.ReactElement = controls[2] as React.ReactElement;
                 if (gainControl)
                 {
-                    controls[3] = (<div ref={this.gainRef}> { gainControl} </div>);
+                    controls[2] = (<div ref={this.gainRef}> { gainControl} </div>);
                 }
                 return controls;
             }
diff --git a/src/JackHost.cpp b/src/JackHost.cpp
index 8be6efb..466c906 100644
--- a/src/JackHost.cpp
+++ b/src/JackHost.cpp
@@ -340,15 +340,18 @@ private:
                 portSubscription.samplesToNextCallback += portSubscription.sampleRate;
                 if (!portSubscription.waitingForAck)
                 {
-                    portSubscription.waitingForAck = true;
                     float value = realtimeActivePedalBoard->GetControlOutputValue(
                         portSubscription.instanceIndex,
                         portSubscription.portIndex);
-
-                    this->realtimeWriter.SendMonitorPortUpdate(
-                        portSubscription.callbackPtr,
-                        portSubscription.subscriptionHandle,
-                        value);
+                    if (value != portSubscription.lastValue)
+                    {
+                        portSubscription.waitingForAck = true;
+                        portSubscription.lastValue = value;
+                        this->realtimeWriter.SendMonitorPortUpdate(
+                            portSubscription.callbackPtr,
+                            portSubscription.subscriptionHandle,
+                            value);
+                    }
                 }
             }
         }
diff --git a/src/Lv2Effect.cpp b/src/Lv2Effect.cpp
index 096d7b7..a4ed1ad 100644
--- a/src/Lv2Effect.cpp
+++ b/src/Lv2Effect.cpp
@@ -93,7 +93,15 @@ Lv2Effect::Lv2Effect(
 
     LV2_Feature **myFeatures = &this->features[0];
 
-    LilvInstance *pInstance = lilv_plugin_instantiate(pPlugin, pHost->GetSampleRate(), myFeatures);
+    LilvInstance *pInstance = nullptr;
+    try {
+        pInstance = lilv_plugin_instantiate(pPlugin, pHost->GetSampleRate(), myFeatures);
+    } catch (const std::exception &e)
+    {
+        this->pInstance = nullptr;
+        throw PiPedalException(SS("Plugin threw an exception: " << e.what()));
+
+    }
     this->pInstance = pInstance;
     if (this->pInstance == nullptr)
     {
diff --git a/src/RingBufferReader.hpp b/src/RingBufferReader.hpp
index 674f122..570dfc0 100644
--- a/src/RingBufferReader.hpp
+++ b/src/RingBufferReader.hpp
@@ -64,6 +64,7 @@ namespace pipedal
         int sampleRate = 0;
         int samplesToNextCallback = 0;
         bool waitingForAck = false;
+        float lastValue = -1E30;
     };
 
     class RealtimeMonitorPortSubscriptions