MIDI convert (MIDI2TŒRN)

Live: https://toern.live/tools/convertmidi/
Source: tools/convertmidi/ (Vite + React app in app/)

What it does

• Import a .mid file (@tonejs/midi)
• Map notes onto the TŒRN grid (pages × steps × rows / voices)
• Preview playback in the browser (Tone.js)
• Tune BPM, subdivision, track enable, overlap filtering, transpose / note priority
• Export a pattern_page_N.txt binary-ish blob matching the firmware’s note table layout (channel, velocity, …) for the current page

Voice / pitch mapping follows device conventions (documented in app/src/utils/midiParser.ts — e.g. voice 1 row relationships to MIDI note numbers).

Code map

Path	Role
app/src/App.tsx	Shell, upload, page state
app/src/utils/midiParser.ts	Parse MIDI → grid notes
app/src/components/NoteGrid.tsx	Grid UI + pattern export bytes
app/src/components/PatternDownload.tsx	Download control
assets/	Built static assets for the site path /tools/convertmidi/

Local development

cd tools/convertmidi/app
npm install
npm run dev

Production build (used by the website tool path):

cd tools/convertmidi/app
npm run build

website/package.json runs this as part of build:convertmidi when building the main site.