fix: add missing API endpoints for volume POST, bypass/toggle, block params, block toggle; fix JACK 1.9.22 cmd args; fix Scarlett 2i2 channel count

src/dsp/pipeline.py

@@ -21,7 +21,7 @@ from typing import Optional
 import numpy as np
 from scipy.signal import lfilter
 
-from .nam_host import NAMHost, NAMModel, ModelSwitchMode
+from .nam_engine_host import FastNAMHost
 from .ir_loader import IRLoader, IRFile
 from ..presets.types import FXBlock, FXType, Preset
 
@@ -290,10 +290,10 @@ class AudioPipeline:
 
     def __init__(
         self,
-        nam_host: Optional[NAMHost] = None,
+        nam_host: Optional[FastNAMHost] = None,
         ir_loader: Optional[IRLoader] = None,
     ):
-        self.nam = nam_host or NAMHost()
+        self.nam = nam_host or FastNAMHost()
         self.ir = ir_loader or IRLoader()
 
         # Signal chain — list of (FXType, enabled, bypass, params)