Adds snapshot system to Helix Stadium:
Backend:
- Snapshot data model (8 slots per preset, captures block bypass
+ params + master volume)
- Snapshot API endpoints: list, save, recall, rename, delete
- Integrated into preset serialization/deserialization
- Tracks current_snapshot in state / WebSocket broadcasts
Frontend:
- Camera icon in header bar with current snapshot number
- SnapshotPanel as slide-up overlay
- 8 snapshot slots in a horizontal row
- Tap to recall filled snapshot, tap empty slot to save
- Press-and-hold (600ms) to save current state
- Inline name editing on tap
- Discard Edits toggle
- Green flash indicator on save
- Delete button for active snapshot
- New Preset button: finds first empty slot, saves with default name
- Looper/Recorder tab: Record/Stop via arecord backend, list captures, play back
- Rig: shows loaded IR name more clearly + quick-link buttons to browse IRs/Models
- Backend: capture/start, capture/stop, captures API endpoints with file serve
- Status bar: CPU load + sample rate from /api/state, TUNER badge shown immediately
- Rig: optimistic toggle updates (bypass/tuner respond instantly), prominent tuner card
- FX Chain: loads real block params from /api/block-params/{fx_type}, Add Block picker with all FX types
- Record: replaced fake multitrack with real Signal Monitor (live I/O VU, clip detect, level history)
- Backend: added _gather_system_stats() returning cpu_percent and sample_rate
- Added input_level and output_level to /api/state (scaled 0-100)
- React RigScreen now reads real levels from state instead of random walk
- When no audio flows, VU meters show flat (0) instead of fake animation
- New dark UI with 7 tabs: Rig, FX Chain, Models, IRs, Presets, Settings, Record
- All screens wired to live API endpoints
- Real-time state via WebSocket + polling fallback
- Models screen: list/load/unload/upload NAM files + Tone3000 search/install
- IRs screen: list/load/unload/upload IR files + Tone3000 search/install
- Presets screen: browse banks, activate, save, delete
- Settings screen: WiFi scan/connect/hotspot, Bluetooth/MIDI, 4CM routing
- Rig screen: live state, volume, bypass, tuner, signal chain
- FX Chain screen: block params, per-block bypass
- Serves at / instead of /ui
- Built with Vite, ~71KB gzipped
Add UI_DIST_DIR auto-detection and /ui static mount in the
FastAPI server so the built React frontend is served alongside
the main dashboard.
- UI_DIST_DIR env var override
- Auto-detect common project layouts (frontend-react/dist,
pi-multifx-pedal-ui/dist)
- Mount with html=True for SPA client-side routing
Pipeline:
- process() dispatches to _process_mono() or _process_4cm() based on routing_mode
- _process_4cm() splits chain at routing_breakpoint: pre blocks on ch0, post on ch1
- _process_single_block() extracted for reuse in both mono and 4cm paths
- routing_mode/routing_breakpoint load from preset via load_preset()
- set_routing() for runtime configuration
- Properties: routing_mode (mono|4cm), routing_breakpoint with validation
Web server:
- GET /api/routing — current routing mode and breakpoint
- POST /api/routing — set routing mode/breakpoint, persist to current preset, WS broadcast
- _gather_state() includes routing_mode and routing_breakpoint
Web UI:
- Settings page: 4CM toggle + breakpoint slider with routing description
- Dashboard: routing badge (4CM/Mono) with breakpoint info
- app.js: WebSocket handler, updateRoutingUI(), toggle4cm(), set4cmBreakpoint()
- style.css: .badge, .badge-4cm, .badge-mono, .routing-status, .routing-desc
Tests: mock pipeline fixture updated with routing_mode/routing_breakpoint
shawn