webtracks.namirsab.dev
webtracks.namirsab.dev
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imperative implementation
Web Tracks: an unofficial fan-made browser groovebox. Not affiliated with Novation or Focusrite.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 10 · Act 28 · Transact 0 · Score: Not yet scored
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set_track
act
imperative
Replace (default) or merge the steps of one track inside a named pattern while everything else keeps playing. steps: {"0": {"note": 48, "velocity": 110}, "8": {"notes": [48, 55]}} for synths, {"0": {}, "4": {"velocity": 80}} for drums. Track-level automation lanes are kept.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
pattern_name |
string | yes | Pattern name. |
track |
string | yes | Track name. |
steps |
object | yes | step index (as string) -> step config; absent steps are rests. |
clear_existing |
boolean | no | true (default) replaces all steps of the track; false merges into them. |
Raw JSON schema
{
"type": "object",
"properties": {
"pattern_name": {
"type": "string",
"description": "Pattern name."
},
"track": {
"type": "string",
"enum": [
"synth1",
"synth2",
"midi1",
"midi2",
"drum1",
"drum2",
"drum3",
"drum4"
],
"description": "Track name."
},
"steps": {
"type": "object",
"additionalProperties": {
"anyOf": [
{
"$ref": "#/$defs/SynthStepConfig"
},
{
"$ref": "#/$defs/DrumStepConfig"
}
]
},
"description": "step index (as string) -> step config; absent steps are rests."
},
"clear_existing": {
"type": "boolean",
"description": "true (default) replaces all steps of the track; false merges into them.",
"default": true
}
},
"required": [
"pattern_name",
"track",
"steps"
],
"additionalProperties": false,
"$defs": {
"DelayConfig": {
"description": "Delay engine parameters.",
"properties": {
"time": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Time"
},
"sync": {
"anyOf": [
{
"maximum": 35,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Sync"
},
"feedback": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Feedback"
},
"width": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Width"
},
"lr_ratio": {
"anyOf": [
{
"maximum": 12,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Lr Ratio"
},
"slew": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Slew"
}
},
"title": "DelayConfig",
"type": "object"
},
"DrumSoundConfig": {
"description": "Drum track sound configuration.",
"properties": {
"sample": {
"anyOf": [
{
"maximum": 63,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Sample/patch index.",
"title": "Sample"
},
"level": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Level"
},
"pitch": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Pitch"
},
"decay": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Decay"
},
"distortion": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Distortion"
},
"eq": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Eq"
},
"pan": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Pan"
}
},
"title": "DrumSoundConfig",
"type": "object"
},
"DrumStepConfig": {
"additionalProperties": false,
"description": "A single step in a drum track.",
"properties": {
"velocity": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Velocity"
},
"enabled": {
"default": true,
"title": "Enabled",
"type": "boolean"
},
"probability": {
"anyOf": [
{
"maximum": 1,
"minimum": 0,
"type": "number"
},
{
"type": "null"
}
],
"default": null,
"title": "Probability"
},
"sample": {
"anyOf": [
{
"maximum": 63,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Per-step sample override.",
"title": "Sample"
},
"micro_step": {
"anyOf": [
{
"maximum": 5,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Micro-step offset within the step (0-5).",
"title": "Micro Step"
}
},
"title": "DrumStepConfig",
"type": "object"
},
"DrumTrackConfig": {
"additionalProperties": false,
"description": "Track data for a drum track within a pattern.",
"properties": {
"steps": {
"additionalProperties": {
"$ref": "#/$defs/DrumStepConfig"
},
"description": "Step index (as string) -> step data.",
"title": "Steps",
"type": "object"
},
"params": {
"anyOf": [
{
"additionalProperties": {
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"type": "object"
},
"propertyNames": {
"enum": [
"pitch",
"decay",
"distortion",
"eq",
"reverb_send",
"delay_send",
"level",
"pan"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Track-level parameter automation. Keys: 'pitch', 'decay', 'distortion', 'eq', 'reverb_send', 'delay_send', 'level', 'pan'. Values are {step_position: value} dicts.",
"title": "Params"
}
},
"title": "DrumTrackConfig",
"type": "object"
},
"FXConfig": {
"description": "Global FX configuration.",
"properties": {
"reverb": {
"anyOf": [
{
"$ref": "#/$defs/ReverbConfig"
},
{
"type": "null"
}
],
"default": null
},
"delay": {
"anyOf": [
{
"$ref": "#/$defs/DelayConfig"
},
{
"type": "null"
}
],
"default": null
},
"reverb_preset": {
"anyOf": [
{
"type": "string"
},
{
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Reverb preset by name or index (0-7).",
"title": "Reverb Preset"
},
"delay_preset": {
"anyOf": [
{
"type": "string"
},
{
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Delay preset by name or index (0-15).",
"title": "Delay Preset"
},
"reverb_sends": {
"anyOf": [
{
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"propertyNames": {
"enum": [
"synth1",
"synth2",
"drum1",
"drum2",
"drum3",
"drum4",
"midi1",
"midi2"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Per-track reverb send level.",
"title": "Reverb Sends"
},
"delay_sends": {
"anyOf": [
{
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"propertyNames": {
"enum": [
"synth1",
"synth2",
"drum1",
"drum2",
"drum3",
"drum4",
"midi1",
"midi2"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Per-track delay send level.",
"title": "Delay Sends"
},
"sidechain": {
"anyOf": [
{
"additionalProperties": {
"$ref": "#/$defs/SidechainConfig"
},
"propertyNames": {
"enum": [
"synth1",
"synth2",
"midi1",
"midi2"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"title": "Sidechain"
}
},
"title": "FXConfig",
"type": "object"
},
"MacroConfig": {
"description": "Configuration for one macro knob (1-8).",
"properties": {
"targets": {
"items": {
"$ref": "#/$defs/MacroTarget"
},
"title": "Targets",
"type": "array"
},
"position": {
"default": 0,
"description": "Initial knob position.",
"maximum": 127,
"minimum": 0,
"title": "Position",
"type": "integer"
}
},
"required": [
"targets"
],
"title": "MacroConfig",
"type": "object"
},
"MacroTarget": {
"description": "A single destination routed to a macro knob.",
"properties": {
"dest": {
"anyOf": [
{
"type": "string"
},
{
"type": "integer"
}
],
"description": "Parameter name (e.g. 'filter_frequency') or macro destination index (0-70). Use get_parameter_reference for the full list.",
"title": "Dest"
},
"start": {
"default": 0,
"description": "Value when knob is at 0.",
"maximum": 127,
"minimum": 0,
"title": "Start",
"type": "integer"
},
"end": {
"default": 127,
"description": "Value when knob is at 127.",
"maximum": 127,
"minimum": 0,
"title": "End",
"type": "integer"
},
"depth": {
"default": 127,
"description": "Modulation depth. 127=full, 64=none.",
"maximum": 127,
"minimum": 0,
"title": "Depth",
"type": "integer"
}
},
"required": [
"dest"
],
"title": "MacroTarget",
"type": "object"
},
"MixerTrackConfig": {
"description": "Mixer settings for a synth track.",
"properties": {
"level": {
"default": 100,
"maximum": 127,
"minimum": 0,
"title": "Level",
"type": "integer"
},
"pan": {
"default": 64,
"maximum": 127,
"minimum": 0,
"title": "Pan",
"type": "integer"
}
},
"title": "MixerTrackConfig",
"type": "object"
},
"ModMatrixEntry": {
"description": "A single mod-matrix routing slot.",
"properties": {
"source1": {
"anyOf": [
{
"enum": [
"direct",
"velocity",
"keyboard",
"LFO 1+",
"LFO 1+/-",
"LFO 2+",
"LFO 2+/-",
"env amp",
"env filter",
"env 3"
],
"type": "string"
},
{
"type": "integer"
}
],
"default": "direct",
"title": "Source1"
},
"source2": {
"anyOf": [
{
"enum": [
"direct",
"velocity",
"keyboard",
"LFO 1+",
"LFO 1+/-",
"LFO 2+",
"LFO 2+/-",
"env amp",
"env filter",
"env 3"
],
"type": "string"
},
{
"type": "integer"
}
],
"default": "direct",
"title": "Source2"
},
"dest": {
"anyOf": [
{
"enum": [
"osc 1 & 2 pitch",
"osc 1 pitch",
"osc 2 pitch",
"osc 1 v-sync",
"osc 2 v-sync",
"osc 1 pulse width / index",
"osc 2 pulse width / index",
"osc 1 level",
"osc 2 level",
"noise level",
"ring modulation 1*2 level",
"filter drive amount",
"filter frequency",
"filter resonance",
"LFO 1 rate",
"LFO 2 rate",
"amp envelope decay",
"filter envelope decay"
],
"type": "string"
},
{
"type": "integer"
}
],
"description": "Destination parameter (use space-separated names, NOT snake_case).",
"title": "Dest"
},
"destination": {
"anyOf": [
{
"enum": [
"osc 1 & 2 pitch",
"osc 1 pitch",
"osc 2 pitch",
"osc 1 v-sync",
"osc 2 v-sync",
"osc 1 pulse width / index",
"osc 2 pulse width / index",
"osc 1 level",
"osc 2 level",
"noise level",
"ring modulation 1*2 level",
"filter drive amount",
"filter frequency",
"filter resonance",
"LFO 1 rate",
"LFO 2 rate",
"amp envelope decay",
"filter envelope decay"
],
"type": "string"
},
{
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Alias for 'dest'. Either 'dest' or 'destination' may be used.",
"title": "Destination"
},
"depth": {
"default": 0,
"description": "Signed depth: -64 to +63. 0 = no modulation.",
"maximum": 63,
"minimum": -64,
"title": "Depth",
"type": "integer"
}
},
"required": [
"dest"
],
"title": "ModMatrixEntry",
"type": "object"
},
"PatternConfig": {
"description": "A named pattern containing track data.",
"properties": {
"length": {
"default": 16,
"description": "Pattern length in steps.",
"maximum": 32,
"minimum": 1,
"title": "Length",
"type": "integer"
},
"tracks": {
"additionalProperties": {
"anyOf": [
{
"$ref": "#/$defs/SynthTrackConfig"
},
{
"$ref": "#/$defs/DrumTrackConfig"
}
]
},
"propertyNames": {
"enum": [
"synth1",
"synth2",
"drum1",
"drum2",
"drum3",
"drum4",
"midi1",
"midi2"
]
},
"title": "Tracks",
"type": "object"
}
},
"title": "PatternConfig",
"type": "object"
},
"ReverbConfig": {
"description": "Reverb engine parameters.",
"properties": {
"type": {
"anyOf": [
{
"maximum": 5,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Type"
},
"decay": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Decay"
},
"damping": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Damping"
}
},
"title": "ReverbConfig",
"type": "object"
},
"ScaleConfig": {
"description": "Musical scale applied to synth/MIDI note quantization.",
"properties": {
"root": {
"default": "C",
"enum": [
"C",
"C#",
"Db",
"D",
"D#",
"Eb",
"E",
"F",
"F#",
"Gb",
"G",
"G#",
"Ab",
"A",
"A#",
"Bb",
"B"
],
"title": "Root",
"type": "string"
},
"type": {
"default": "chromatic",
"enum": [
"natural minor",
"minor",
"major",
"dorian",
"phrygian",
"mixolydian",
"melodic minor",
"harmonic minor",
"bebop dorian",
"blues",
"minor pentatonic",
"hungarian minor",
"ukranian dorian",
"marva",
"todi",
"whole tone",
"chromatic"
],
"title": "Type",
"type": "string"
}
},
"title": "ScaleConfig",
"type": "object"
},
"SidechainConfig": {
"description": "Sidechain compressor settings for a synth or MIDI track.",
"properties": {
"preset": {
"anyOf": [
{
"maximum": 7,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "Sidechain preset (1-7). Required to activate sidechain on hardware. 0 or omit = OFF.",
"title": "Preset"
},
"source": {
"default": "off",
"enum": [
"drum1",
"drum2",
"drum3",
"drum4",
"off"
],
"title": "Source",
"type": "string"
},
"attack": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Attack"
},
"hold": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Hold"
},
"decay": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Decay"
},
"depth": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Depth"
}
},
"title": "SidechainConfig",
"type": "object"
},
"SynthSoundConfig": {
"description": "Synth engine patch configuration (synth1, synth2).",
"properties": {
"preset": {
"anyOf": [
{
"enum": [
"pad",
"bass",
"lead",
"pluck"
],
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"description": "Base preset to start from before applying params.",
"title": "Preset"
},
"name": {
"anyOf": [
{
"maxLength": 16,
"type": "string"
},
{
"type": "null"
}
],
"default": null,
"description": "Patch name.",
"title": "Name"
},
"params": {
"anyOf": [
{
"additionalProperties": {
"type": "integer"
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Synth parameter name -> value (0-127). Use get_parameter_reference for names.",
"title": "Params"
},
"mod_matrix": {
"anyOf": [
{
"items": {
"$ref": "#/$defs/ModMatrixEntry"
},
"type": "array"
},
{
"type": "null"
}
],
"default": null,
"description": "Mod matrix routing slots.",
"title": "Mod Matrix"
},
"macros": {
"anyOf": [
{
"additionalProperties": {
"$ref": "#/$defs/MacroConfig"
},
"propertyNames": {
"enum": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Macro knob definitions. Keys are '1' through '8'.",
"title": "Macros"
}
},
"title": "SynthSoundConfig",
"type": "object"
},
"SynthStepConfig": {
"additionalProperties": false,
"description": "A single step in a synth or MIDI track.\n\nOnly these fields are allowed — no others. Use 'macros' for p-locks, NOT 'params' or 'p-locks'.",
"properties": {
"note": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"description": "MIDI note number. Mutually exclusive with 'notes'.",
"title": "Note"
},
"notes": {
"anyOf": [
{
"items": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"type": "array"
},
{
"type": "null"
}
],
"default": null,
"description": "Multiple MIDI notes for polyphony. Mutually exclusive with 'note'.",
"title": "Notes"
},
"velocity": {
"anyOf": [
{
"maximum": 127,
"minimum": 0,
"type": "integer"
},
{
"type": "null"
}
],
"default": null,
"title": "Velocity"
},
"gate": {
"anyOf": [
{
"maximum": 16,
"minimum": 0,
"type": "number"
},
{
"type": "null"
}
],
"default": null,
"description": "Gate length in steps (e.g. 0.5 = half step, 2.0 = two steps). Max 16.",
"title": "Gate"
},
"tie": {
"default": false,
"description": "Tie forward — sustain this note into the next triggered step.",
"title": "Tie",
"type": "boolean"
},
"enabled": {
"default": true,
"title": "Enabled",
"type": "boolean"
},
"probability": {
"anyOf": [
{
"maximum": 1,
"minimum": 0,
"type": "number"
},
{
"type": "null"
}
],
"default": null,
"description": "Playback probability, 0.0 to 1.0.",
"title": "Probability"
},
"macros": {
"anyOf": [
{
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"propertyNames": {
"enum": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Per-step macro p-locks. Keys are macro numbers '1'-'8', values are 0-127. These lock the macro knob position for this step.",
"title": "Macros"
}
},
"title": "SynthStepConfig",
"type": "object"
},
"SynthTrackConfig": {
"additionalProperties": false,
"description": "Track data for a synth or MIDI track within a pattern.",
"properties": {
"steps": {
"additionalProperties": {
"$ref": "#/$defs/SynthStepConfig"
},
"description": "Step index (as string, e.g. '0', '4') -> step data.",
"title": "Steps",
"type": "object"
},
"macros": {
"anyOf": [
{
"additionalProperties": {
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"type": "object"
},
"propertyNames": {
"enum": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Track-level macro automation. Keys are macro numbers '1'-'8'. Values are {step_position: value} dicts. Float positions supported for micro-step resolution (e.g. '2.5').",
"title": "Macros"
},
"mixer": {
"anyOf": [
{
"additionalProperties": {
"additionalProperties": {
"maximum": 127,
"minimum": 0,
"type": "integer"
},
"type": "object"
},
"propertyNames": {
"enum": [
"reverb_send",
"delay_send",
"level",
"pan"
]
},
"type": "object"
},
{
"type": "null"
}
],
"default": null,
"description": "Track-level mixer automation. Keys: 'reverb_send', 'delay_send', 'level', 'pan'. Values are {step_position: value} dicts.",
"title": "Mixer"
}
},
"title": "SynthTrackConfig",
"type": "object"
}
}
}
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