MIDI & clock

toern_midi.ino owns MIDI parsing, clock generation/following, and note/transport bridging into the sequencer/synths.

Hardware / library setup

• TRS MIDI via Serial (custom MidiSettings, enlarged Serial8 buffers in toern.ino)
• MIDI.h handlers for note on/off, clock, start/stop
• Optional pulse-clock output helpers (pulseClock*, EEPROM load/store)

Clock paths

Direction	Entry points
Soft MIDI clock out	updateMidiClockOutput, midiClockTick
External clock in	myClock, averaging / BPM stability helpers
Sequencer beat	playTimer / playback aligned with transport state

checkMidi() is called early in loop() for lower latency.

Notes ↔ engine

• Incoming notes → handleNoteOn / handleNoteOff → sample or synth triggers (respecting mutes / child lock)
• Outgoing notes → MidiSendNoteOn and related send helpers when MIDI out is enabled

Editing safely

Clock math and ISR interplay are easy to break. Prefer small, well-tested changes; there are local planning notes (_internal-docs/MIDI_CLOCK_RELIABILITY_PLAN.md) describing past reliability work if you have that folder checked out.