Stems & Presets¶

4 tools for stem separation and preset management.

Stem Splitter (2)¶

Tool	Description
`list_split_modes`	List all available stem separation modes with SDR scores
`split_stems`	Split an audio file into stems using SOTA models. 7 modes. Optional auto-import

Stem separation modes¶

Mode	Model	Stems	Best for
`ensemble`	BS-Roformer + HTDemucs	4	Best quality, slowest
`scnet`	SCNet	4	Sparse compression network
`bs6`	BS-Roformer 6-stem	6	drums/bass/vocals/other/guitar/piano
`polarformer`	MelBand Roformer	4	Polarized separation
`dereverb`	BS-Roformer dereverb	1	Remove reverb from a stem
`drumsep`	Drum separation	4+	Kick/snare/hat/toms
`denoise`	MelBand Roformer	1	Noise removal

Example: split and import¶

# Split a Suno track into stems
result = await server.mcp_opendaw_split_stems(
    file_path="/path/to/suno_track.wav",
    mode="bs6",
    auto_import=True  # automatically creates audio regions in the DAW
)
# Returns: {"stems": ["drums.wav", "bass.wav", "vocals.wav", ...],
#           "imported_regions": 6}

GPU requirement¶

Stem separation runs locally on GPU. Models total ~3 GB and are downloaded on first use. See the stem-splitter/ directory for setup instructions.

Preset Management (2)¶

Tool	Description
`save_effect_preset`	Encode an effect chain as a `.opb` preset bundle (ZIP)
`load_effect_preset`	Load a `.opb` preset and decode via PresetDecoder

.opb format¶

.opb files are ZIP bundles containing:

preset.opb (ZIP)
├── version        — preset format version
├── meta.json      — metadata (name, author, description)
└── preset.odp     — raw binary preset data (OPRE magic 0x4F505245)

These are drag-and-drop compatible with openDAW's UI.

Example: save and load presets¶

# Save a reverb chain as a preset
await server.mcp_opendaw_save_effect_preset(
    unit_index=0,
    output_path="my_reverb.opb",
    name="My Reverb",
    description="Dark plate reverb with pre-delay"
)

# Load it onto another AU
await server.mcp_opendaw_load_effect_preset(
    file_path="my_reverb.opb",
    unit_index=2
)

Engine Control (8)¶

Tool	Description
`capture_realtime`	Capture realtime audio output from the DAW engine
`engine_panic`	Send a panic signal — stops all notes immediately
`engine_sleep`	Put the audio engine to sleep (suspend processing)
`engine_wake`	Wake the audio engine from sleep
`get_engine_status`	Real-time status: playing, position, BPM, CPU load, recording
`query_loading_complete`	Check if all audio samples are loaded and ready
`set_metronome`	Configure metronome (enabled, gain, beat_subdivision)
`start_engine`	Start the audio engine (AudioWorklet) after setup

MIDI Output (1)¶

Tool	Description
`list_midi_output_devices`	List all MIDI output devices (hardware MIDI outputs)

Samples (2)¶

Tool	Description
`get_sample_info`	Get detailed info about an audio sample by UUID
`list_samples`	List all audio file samples used in the project

Debugging & Control (3)¶

Tool	Description
`evaluate_raw`	Execute arbitrary JavaScript in the DAW V8 context
`screenshot_daw`	Take a screenshot of the openDAW UI (base64 PNG)
`wait_for_condition`	Wait for a JavaScript condition to evaluate to true

Editing (2)¶

Tool	Description
`redo`	Redo the last undone operation
`undo`	Undo the last editing operation