Add a MIDI Sync settings card (before the binding cards) with Send and Receive
MIDI clock toggles, both off by default and persisted.
Send: a dedicated thread emits clock (0xF8) at 24 PPQN plus Start/Stop on the
transport edges to every attached MIDI device (USB + Bluetooth), and — because a
sequencer should drive gear, not just its tempo — also forwards the tracks'
note-on/off on each cell's MIDI channel. Notes are queued from the audio thread
through a lock-free ring and drained by the send thread, mirroring the mono-per-
track cell lifecycle; stop/pause/panic release everything so external notes never
hang. (Per-channel Arpeggiator/Transposer are internal FX and aren't reflected.)
Receive: MidiInput now forwards real-time bytes to the clock module, which follows
an external clock — Start/Continue starts the transport, Stop pauses it, and the
pulse rate drives the tempo (a tempo + transport follow, not a sample-locked slave).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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