midi-sync.cpp

bool playing;

void setup() {
    playing = false;
    float bpm = 50;
    clock.setBpm(bpm * 24); //24 ppqn https://en.wikipedia.org/wiki/MIDI_beat_clock
    ofAddListener(clock.beatEvent, this, &ofApp::tick);
}

void ofApp::tick(void){
    if(playing) {
        if(counter == 0) {
            cout << "====== Quarter Note =======" << endl;
        } else {
            cout << "." << endl;
        }
        if(counter == 23) {
            counter = 0;
        } else {
            counter++;
        }
        chain1.midi()->sendMidiByte(MIDI_TIME_CLOCK);
        chain2.midi()->sendMidiByte(MIDI_TIME_CLOCK);
    }
}

void ofApp::togglePlaying() {
    playing = !playing;
    if(playing) {
        chain1.sendMidiOn(note);
        chain2.sendMidiOn(note);
        chain1.midi()->sendMidiByte(MIDI_START);
        chain2.midi()->sendMidiByte(MIDI_START);
        clock.start();
        counter = 0;
    } else {
        chain1.sendMidiOff(note);
        chain2.sendMidiOff(note);
        chain1.midi()->sendMidiByte(MIDI_STOP);
        chain2.midi()->sendMidiByte(MIDI_STOP);
        clock.stop();
    }
}

void ofApp::keyPressed(int key){
    if(key == ' ') {
        togglePlaying();
    }
}