Open the complete interactive DAW. Use this when the user wants to see or edit the studio visually.

Return the authoritative DAW project, including transport, tracks, steps, clips, mixer, effects, plugins, EQ, and automation.

Create a fresh demo-ready audio project, replacing the current project.

Rename the current project.

Change playback, recording, tempo, time signature, swing, metronome, position, and loop settings.

Add an instrument or audio track linked to a built-in, sampler, WAM, or VST3 instrument slot.

Update track name, color, type, instrument, preset, oscillator, or instrument parameters.

Remove a track and its notes, clips, mixer channel, effects, plugins, and related automation.

Edit step-sequencer or piano-roll notes. Each update can toggle a step and set MIDI note, velocity, and gate length.

Place an audio file on a track. Pass a data URL for bundled audio or a source URL for a remotely hosted file.

Move, trim, rename, or change the gain of an audio clip.

Remove an audio clip from a track.

Set volume, panning, mute, solo, and send levels for a track or the master channel.

Set the four-band EQ gains in dB for a track.

Add a filter, delay, reverb, distortion, compressor, chorus, or limiter to a track effects chain.

Enable, bypass, rename, mix, or change parameters on an effect slot.

Remove an effect from a track effects chain.

Add a built-in, Web Audio Module (WAM), or VST3 plugin slot. VST3 slots expose parameters and state for a native bridge.

Enable, bypass, rename, change parameters, or store opaque plugin state for a plugin slot.

Remove a plugin slot from a track.

Create or update an automation lane for master/track volume, pan, effect, plugin, or instrument parameters.

Remove an automation lane.

Export the complete project as portable JSON.

Replace the current project from an exported project JSON document.

Offline-render the current project to a stereo 16-bit WAV file and return playable audio.

Retrieve a recent rendered WAV file by render ID.