Edits save automatically in this browser. Use Save project to download a JSON backup and Open project to reopen it on another device. Local saves do not sync across devices and can be removed when browser data is cleared.

Invalid notes show a line number: correct them before playing or exporting. Projects support up to 16 tracks and 2,048 notes in total, with a 120-beat limit per track (180 seconds at 40 BPM). AI requests can be cancelled; a valid result replaces your tracks only after confirmation. Cancel stops waiting in the browser; provider processing may already be underway.

Describe a scene or feeling, or start with a preset. Optionally choose mood, bar length, musical key, expression and instruments; set tempo with BPM. Checked instruments are the only ones allowed; leave all unchecked to choose from the description. Gentle & spacious limits note strength, chord size and attacks per bar. Quiet piano selects solo piano at 72 BPM with gentle expression; add Strings if you want them. Selected controls take priority over conflicting prompt wording. Create music produces tracks with shared timing and key. To change a piece, describe the change and choose Refine current piece. Regenerate this track changes only its instrument part; Undo restores the previous version during this session.

Select a note in the piano roll and use its pitch, beat, length and strength controls. Drag to move it. Double-click empty space to add a short note. On touch devices, use + Note to add a note and then adjust its controls. Pause/resume preserves playback position; Loop repeats the arrangement, including its planned silent spaces. Tempo, echo and loop settings are set before playback; mixer volume, mute and solo respond while playing. Editing notes stops playback so the next play uses the revised arrangement.

Export WAV downloads a rendered recording; MIDI downloads editable note and timing instructions for other music software. Acoustic + synth uses a compact piano, violin and flute sample bank; other instruments, out-of-range pitches and failed sample loads use synthesis. The instruments are intended for sketching rather than full orchestral realism.

Advanced note timing: @0 C4 1 80 starts C4 at beat zero for one beat. @0.5 E4 1 70 overlaps it. Plain note lines remain supported and advance sequentially. Bars use 4/4, starting at beat zero. AI-generated notes must fit within the requested bar count.

ORKSTR lets you compose multi-layered orchestral music by writing simple text instructions. Each track represents an independent instrument — strings, brass, choir, drums — and they all play simultaneously to produce the full mix.

Good for: game music prototyping, musical composition experiments, sketching ideas before professional DAW work.

Each line = one note. The format is always:

A simple three-track piece: melody, strings, and bass drum. Copy each track into its slot and hear the difference between one track and all three together.

Don't want to write manually? Open the AI panel, describe what you want in plain English, and press Generate. The system will create complete tracks ready to play and edit.

After listening, press ↓ Export WAV to download the audio file. Everything is rendered locally in your browser — no upload, no servers, your file stays private.