def start_supervisor(display, mportin, mportout, bpm):
midi_in = MidiInListener(mportin)
midi_out = MidiOut(mportout)
ticker = SelfTicker(bpm)
clock = Clock('tick' if bpm else 'midi')
midi_in.start()
midi_out.start()
ticker.start()
clock.start()
display.start()
supervisor = Supervisor()
try:
supervisor.run()
finally:
debug("Stopping everything")
midi_in.keep_running = False
midi_out.keep_running = False
ticker.keep_running = False
clock.keep_running = False
display.keep_running = False
supervisor.keep_running = False
debug("Threads stopped")
exit()
debug("exiting?")
