fix: NAM amp level param now controls input drive, JACK period 256, toggle API matching

main.py

@@ -25,7 +25,7 @@ import yaml
 from src.system.audio import AudioConfig, AudioSystem, JackAudioClient, _jack_is_running
 from src.system.defaults import ensure_defaults_exist
 from src.dsp.pipeline import AudioPipeline
-from src.dsp.nam_host import NAMHost
+from src.dsp.nam_engine_host import FastNAMHost
 from src.dsp.ir_loader import IRLoader
 from src.presets.manager import PresetManager
 from src.presets.types import Channel, MIDIMapping, Preset
@@ -79,7 +79,7 @@ class PedalApp:
         self.audio_config: AudioConfig | None = None
         self.audio_system: AudioSystem | None = None
         self.jack_audio: JackAudioClient | None = None
-        self.nam_host: NAMHost | None = None
+        self.nam_host: FastNAMHost | None = None
         self.ir_loader: IRLoader | None = None
         self.pipeline: AudioPipeline | None = None
         self.presets: PresetManager | None = None
@@ -133,9 +133,10 @@ class PedalApp:
                 logger.info("JACK disabled in config — skipping audio server start")
 
             # ── 2. DSP pipeline (NAM + IR + FX chain) ────────────
-            self.nam_host = NAMHost()
+            self.nam_host = FastNAMHost()
             self.ir_loader = IRLoader()
             self.pipeline = AudioPipeline(nam_host=self.nam_host, ir_loader=self.ir_loader)
+            self.nam_host.warm_up()
 
             # Set pipeline routing from config mode
             if audio_mode == "stereo_4cm":