R1: Dashboard 500 fix, Phase 2/7 uncommitted changes

- Fix dashboard 500 when deps disconnected — _gather_state() now returns
  full defaults instead of bare {'connected': False}
- Phase 2: FX param schemas aligned with DSP implementations
- Phase 7: Pipeline routing, preset manager improvements
- Factory presets: cleanup and normalization

Fixes dashboard crash on disconnected state (dogfood issue #1)

presets/factory/bank_0/preset_0.json

@@ -7,9 +7,9 @@
   "chain": [
     {"fx_type": "noise_gate", "enabled": true, "bypass": false, "params": {"threshold": 0.01}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "compressor", "enabled": true, "bypass": false, "params": {"threshold": 0.3, "ratio": 4.0, "gain": 0.8}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/clean_fender.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/twin_reverb.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.5, "mid": 0.5, "treble": 0.5}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "reverb", "enabled": true, "bypass": false, "params": {"decay": 0.3, "mix": 0.2}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/vintage-1x12.wav"},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.85}, "nam_model_path": "", "ir_file_path": ""}
   ],
   "midi_mappings": {

presets/factory/bank_0/preset_1.json

@@ -7,9 +7,9 @@
   "chain": [
     {"fx_type": "noise_gate", "enabled": true, "bypass": false, "params": {"threshold": 0.008}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "overdrive", "enabled": true, "bypass": false, "params": {"drive": 0.3, "gain": 0.9}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/vox_ac30.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/alnico_blue.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.4, "mid": 0.6, "treble": 0.7}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "delay", "enabled": true, "bypass": false, "params": {"time": 350.0, "feedback": 0.25, "mix": 0.2}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/boutique-1x12.wav"},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.8}, "nam_model_path": "", "ir_file_path": ""}
   ],
   "midi_mappings": {}

presets/factory/bank_0/preset_2.json

@@ -6,10 +6,10 @@
   "tuner_enabled": false,
   "chain": [
     {"fx_type": "noise_gate", "enabled": true, "bypass": false, "params": {"threshold": 0.01}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/roland_jc120.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/jc120_ir.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.5, "mid": 0.5, "treble": 0.6}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "chorus", "enabled": true, "bypass": false, "params": {"rate": 0.35, "depth": 0.5, "mix": 0.4}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "reverb", "enabled": true, "bypass": false, "params": {"decay": 0.4, "mix": 0.25}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/american-2x12.wav"},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.82}, "nam_model_path": "", "ir_file_path": ""}
   ],
   "midi_mappings": {}

presets/factory/bank_0/preset_3.json

@@ -7,9 +7,9 @@
   "chain": [
     {"fx_type": "compressor", "enabled": true, "bypass": false, "params": {"threshold": 0.25, "ratio": 6.0, "gain": 0.7}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "boost", "enabled": true, "bypass": false, "params": {"gain_db": 3.0}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/fender_twin.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/american_2x12.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.4, "mid": 0.7, "treble": 0.5}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "reverb", "enabled": true, "bypass": false, "params": {"decay": 0.5, "mix": 0.3}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/jazz-1x15.wav"},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.78}, "nam_model_path": "", "ir_file_path": ""}
   ],
   "midi_mappings": {}

presets/factory/bank_1/preset_0.json

@@ -7,9 +7,9 @@
   "chain": [
     {"fx_type": "noise_gate", "enabled": true, "bypass": false, "params": {"threshold": 0.015}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "overdrive", "enabled": true, "bypass": false, "params": {"drive": 0.55, "gain": 0.8}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/marshall_plexi.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/greenback_4x12.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.6, "mid": 0.4, "treble": 0.7}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "delay", "enabled": true, "bypass": false, "params": {"time": 380.0, "feedback": 0.3, "mix": 0.25}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/british-4x12.wav"},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.75}, "nam_model_path": "", "ir_file_path": ""}
   ],
   "midi_mappings": {

presets/factory/bank_1/preset_1.json

@@ -9,11 +9,11 @@
     {"fx_type": "compressor", "enabled": true, "bypass": false, "params": {"threshold": 0.4, "ratio": 3.0, "gain": 1.2}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "overdrive", "enabled": true, "bypass": false, "params": {"drive": 0.7, "gain": 0.7}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "distortion", "enabled": true, "bypass": false, "params": {"drive": 0.6, "gain": 0.6}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/5150_stealth.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/v30_4x12.wav"},
+    {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.5, "mid": 0.3, "treble": 0.8}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "delay", "enabled": true, "bypass": false, "params": {"time": 450.0, "feedback": 0.35, "mix": 0.35}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "reverb", "enabled": true, "bypass": false, "params": {"decay": 0.6, "mix": 0.3}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.9}, "nam_model_path": "", "ir_file_path": ""}
+    {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.9}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/british-4x12.wav"}
   ],
   "midi_mappings": {
     "delay_feedback": {"cc_number": 18, "channel": 1, "min_val": 0.0, "max_val": 1.0}

presets/factory/bank_1/preset_2.json

@@ -8,10 +8,9 @@
     {"fx_type": "noise_gate", "enabled": true, "bypass": false, "params": {"threshold": 0.03}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "boost", "enabled": true, "bypass": false, "params": {"gain_db": 8.0}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "distortion", "enabled": true, "bypass": false, "params": {"drive": 0.8, "gain": 0.5}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/peavey_6505.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/v30_4x12.wav"},
     {"fx_type": "eq", "enabled": true, "bypass": false, "params": {"bass": 0.6, "mid": 0.3, "treble": 0.7}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.7}, "nam_model_path": "", "ir_file_path": ""}
+    {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.7}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/modern-4x12.wav"}
   ],
   "midi_mappings": {}
 }

presets/factory/bank_1/preset_3.json

@@ -6,11 +6,10 @@
   "tuner_enabled": false,
   "chain": [
     {"fx_type": "compressor", "enabled": true, "bypass": false, "params": {"threshold": 0.3, "ratio": 4.0, "gain": 0.9}, "nam_model_path": "", "ir_file_path": ""},
-    {"fx_type": "nam_amp", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "factory/fender_twin.nam", "ir_file_path": ""},
-    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {}, "nam_model_path": "", "ir_file_path": "factory/american_2x12.wav"},
     {"fx_type": "phaser", "enabled": true, "bypass": false, "params": {"rate": 0.2, "depth": 0.6, "feedback": 0.4}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "chorus", "enabled": true, "bypass": false, "params": {"rate": 0.3, "depth": 0.7, "mix": 0.5}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "delay", "enabled": true, "bypass": false, "params": {"time": 500.0, "feedback": 0.4, "mix": 0.35}, "nam_model_path": "", "ir_file_path": ""},
+    {"fx_type": "ir_cab", "enabled": true, "bypass": false, "params": {"wet": 1.0, "dry": 0.0}, "nam_model_path": "", "ir_file_path": "~/.pedal/irs/american-2x12.wav"},
     {"fx_type": "reverb", "enabled": true, "bypass": false, "params": {"decay": 0.8, "mix": 0.4}, "nam_model_path": "", "ir_file_path": ""},
     {"fx_type": "volume", "enabled": true, "bypass": false, "params": {"level": 0.78}, "nam_model_path": "", "ir_file_path": ""}
   ],

presets/factory/irs/README.md

@@ -0,0 +1,38 @@
+# Pi Multi-FX Pedal — Default Cabinet IR Files
+
+Synthetic impulse responses (.wav) for guitar cabinet simulation.
+Generated using DSP filter cascades (Butterworth LP/HP + parametric
+peak/notch filters + exponential decay envelope).
+
+**All IRs are 48kHz, 16-bit mono WAV files.**
+
+| File | Cabinet Model | Taps | Length | Description |
+|------|--------------|------|--------|-------------|
+| `vintage-1x12.wav` | Vintage 1x12 — Fender-style Open Back | 2048 | 43ms | Warm, scooped cleans with bell-like top end. Models a Fender-style 1x12 open-back combo. |
+| `british-4x12.wav` | British 4x12 — Marshall-style Closed Back | 4096 | 85ms | Mid-forward, aggressive rock tones with tight low end. Models a Marshall 1960A-style 4x12 closed-back cabinet. |
+| `american-2x12.wav` | American 2x12 — Vox-style Open Back | 2048 | 43ms | Chimey, complex midrange with sparkling highs. Models a Vox AC30-style 2x12 open-back cabinet. |
+| `modern-4x12.wav` | Modern 4x12 — Mesa/Boogie-style Closed Back | 4096 | 85ms | Tight low-end, aggressive mids, smooth highs. Models a Mesa Rectifier-style 4x12 closed-back cab. |
+| `jazz-1x15.wav` | Jazz 1x15 — Deep Open Back | 2048 | 43ms | Deep, warm, scooped tone for jazz cleans. Models a 15-inch speaker in a large open-back cab. |
+| `boutique-1x12.wav` | Boutique 1x12 — Dumble-style Open Back | 2048 | 43ms | Smooth, rounded cleans with enhanced mid complexity. Models a Dumble-style 1x12 open-back combo. |
+| `mini-1x8.wav` | Mini 1x8 — Small Practice Amp | 1024 | 21ms | Lo-fi, boxy tone for vintage radio-style sounds. Models a small 8-inch practice amp speaker. |
+
+## Usage
+
+These IRs are loaded by the `IRLoader` class through the pedal's cab simulation.
+Place them in `~/.pedal/irs/` or reference them by absolute path in preset chain blocks.
+
+## Replacement
+
+Replace any `.wav` file with a real captured IR (48kHz, 16-bit mono) to
+upgrade from synthetic to authentic cabinet tone. The pedal treats all
+`.wav` files in the IR directory identically.
+
+## Cabinet Type Guide
+
+- **Vintage 1x12** — Fender Deluxe / Princeton-style cleans. Scooped mids, warm lows.
+- **British 4x12** — Marshall 1960 / JCM-style crunch and rock. Mid-forward, aggressive.
+- **American 2x12** — Vox AC30-style chime. Complex mids, sparkling treble.
+- **Modern 4x12** — Mesa Rectifier-style high gain. Tight lows, smooth highs.
+- **Jazz 1x15** — Polytone / Henriksen-style jazz. Deep lows, scooped mids.
+- **Boutique 1x12** — Dumble / Two-Rock-style. Smooth, complex midrange.
+- **Mini 1x8** — Small practice amp. Boxy, lo-fi, vintage radio tone.