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_pattern
act
imperative
Define or replace one named pattern (a slot 1-8 on every track) with song-format track configs: {"synth1": {"steps": {"0": {"note": 60, "gate": 1}}}, "drum1": {"steps": {"0": {}, "4": {}}}}. Tracks not given are silent in this pattern. Length must match the other patterns (all 16 or all 32). When the sequencer is stopped the new pattern is selected on all tracks.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
name |
string | yes | Pattern name, e.g. "intro". |
tracks |
object | yes | track name -> track config. |
length |
integer | no | Pattern length in steps (default 16). |
Raw JSON schema
{
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "Pattern name, e.g. \"intro\".",
"minLength": 1,
"maxLength": 32
},
"tracks": {
"type": "object",
"minProperties": 1,
"propertyNames": {
"enum": [
"synth1",
"synth2",
"midi1",
"midi2",
"drum1",
"drum2",
"drum3",
"drum4"
]
},
"additionalProperties": {
"anyOf": [
{
"$ref": "#/$defs/SynthTrackConfig"
},
{
"$ref": "#/$defs/DrumTrackConfig"
}
]
},
"description": "track name -> track config."
},
"length": {
"type": "integer",
"minimum": 1,
"maximum": 32,
"description": "Pattern length in steps (default 16)."
}
},
"required": [
"name",
"tracks"
],
"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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