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In the lab · Built and working, but only in the direct download of mChatAI+, behind the Show Experimental switch on the home screen.

LoopStar

Launch loops on a six-lane grid where every change lands on the bar, then export the song as a WAV.

In the lab · Experimental, in the direct download only — switch on Show Experimental on the home screen to see it

What it does

• Plays loops on a six-lane grid - drums, hats, percussion, bass, music, fx - where clicking a cell starts the transport and queues the loop to land on the next bar rather than cutting in mid-beat, and a scene button switches every lane at once
• Loads sound packs as content: 23 packs ship in mchatai-source with base tempos from 75 to 174 BPM, and none of the loop names or tempos are compiled into the app
• Sets tempo three ways - a 50-150% slider against the pack's base tempo, an exact BPM you type, or tapping in time - with a Reset button that returns to the pack default
• A "Make it new" menu generates fresh material in the session's key: New Beat, New Chords, New Bass or New Melody, with a different variation each press, and the melody can play through any of the 128 General MIDI instruments
• Samples what your Mac is playing (via ScreenCaptureKit) or your microphone, then lets you scrub the take and punch a loop out of it onto a lane; a Samples browser keeps and analyses those captures
• Builds a song from parts (Verse 16, Chorus 8, and so on), each carrying its own chords and scene, with a FOLLOW SONG button that plays the arrangement through and an "Export Song as WAV..." action that writes it to a file
• "Play Like..." loads one of 68 public-domain compositions from the Song Book offline; type any other title and it researches that song's chords and key on the web, cites the source, and builds inspired-by material rather than a copy
• A Score window opens on its own, showing guitar chord shapes, piano voicings and solo scales lighting up in time with the song

How to try it

1. Open LoopStar and choose a pack from the pack menu in the transport bar - it is labelled with the current pack's name.
2. Click any cell in the grid; the transport starts and the loop drops in on the next bar.
3. Click one of the scene buttons above the grid to switch every lane together.
4. Open the session menu (its label is your session's name) and choose "Export Song as WAV...".

Works with

• AI Audio (Audio Library) - the exportToAudioLibrary verb renders the arrangement to a bar-exact WAV and files it there
• Vault - LoopStar sessions and jingles appear as products, with "Open in LoopStar" and "Open in AI Audio" actions
• mchatai-source - packs.json (23 packs), styles.json (24 genres), the 68-song Song Book and the downloadable instrument catalog are content that ships without an app update
• MIDI hardware - LoopStarMIDIService drives a live instrument strip and a bar-synced "Capture" that records played chords into the chord track

Drive it from an agent

These commands are callable by Claude Code, Codex, or any agent talking to mChatAI+ through the portal:

loopstar.listGenres
loopstar.setGenre
loopstar.setBPM
loopstar.setKey
loopstar.getState
loopstar.exportToAudioLibrary
loopstar.craftChords
loopstar.craftMelody
loopstar.jingle
loopstar.openJingle
loopstar.listJingleForms

LoopStar ships with mChatAI+. Native macOS app. Your own API keys, or fully on-device. Get mChatAI+

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