813 B
Architecture
core/midi.ts turns a bounded SMF byte stream into inert tracks and absolute-tick events. Chunk boundaries, four-byte VLQs, running status, event counts, SysEx size, PPQN division and known fixed-length meta events are validated before data is exposed. Editing functions clone this model and preserve stable event ordering.
Workbench.tsx keeps the last valid document during failed imports or operations. The SVG piano roll renders at most 5,000 notes. Playback maps ticks through the tempo map, creates fixed application-owned sine oscillators and can stop immediately by closing the active AudioContext; imported bytes never become code or remote references.
All Vite assets use relative paths for nested portal mounting. Release packaging fixes ZIP ordering, timestamps and permissions.