MIDI_OP_MODE_MIDI1
if (midi2->operation_mode != MIDI_OP_MODE_MIDI1)
op_mode = MIDI_OP_MODE_MIDI1;
if (op_mode != MIDI_OP_MODE_MIDI1)
if (op_mode == MIDI_OP_MODE_MIDI1)
case MIDI_OP_MODE_MIDI1: