some pitch bend fixes

fm_midi_driver.c

@@ -13,13 +13,11 @@ void fm_midi_driver_set_pms_ams(struct fm_driver *driver, int channel, uint8_t p
 void fm_midi_driver_set_pitch(struct fm_driver *driver, int channel, int pitch) {
 	struct fm_midi_driver *mididrv = (struct fm_midi_driver *)driver;
 	if(mididrv->channels[channel].on && pitch != mididrv->channels[channel].pitch) {
-		pitch >>= 8;
-		pitch -= 5;
 		int root_pitch = mididrv->channels[channel].note << 6;
-		int detune = (pitch - root_pitch);
+		int detune = ((pitch >> 8) - 5 - root_pitch);
 
 		if(detune != mididrv->channels[channel].detune) {
-			midi_track_write_pitch_bend(&mididrv->midi_file->tracks[channel + 1], mididrv->channels[channel].ticks, channel, detune);
+			midi_track_write_pitch_bend(&mididrv->midi_file->tracks[channel + 1], mididrv->channels[channel].ticks, channel, 8192 + detune * 4);
 			mididrv->channels[channel].detune = detune;
 			mididrv->channels[channel].ticks = 0;
 		}
@@ -40,7 +38,7 @@ void fm_midi_driver_note_on(struct fm_driver *driver, int channel, uint8_t op_ma
 	int note = pitch >> 6;
 	mididrv->channels[channel].note = note;
 	if(detune != mididrv->channels[channel].detune) {
-		midi_track_write_pitch_bend(&mididrv->midi_file->tracks[channel + 1], mididrv->channels[channel].ticks, channel, detune);
+		midi_track_write_pitch_bend(&mididrv->midi_file->tracks[channel + 1], mididrv->channels[channel].ticks, channel, 8192 + detune * 4);
 		mididrv->channels[channel].ticks = 0;
 	}
 	midi_track_write_note_on(&mididrv->midi_file->tracks[channel + 1], mididrv->channels[channel].ticks, channel, note, 127);

mdx2midi.c

@@ -67,6 +67,22 @@ int main(int argc, char **argv) {
 		struct midi_file midi_file;
 		midi_file_init(&midi_file, MIDI_FORMAT_MULTI_TRACKS, 16, 48);
 
+		for(int t = 0; t < 16; t++) {
+			struct midi_track *track = midi_file.tracks + t;
+			char buf[256];
+			snprintf(buf, sizeof(buf), "Channel %c (%s)", mdx_track_name(t), t < 8 ? "FM" : "ADPCM");
+			midi_track_write_track_name(track, 0, buf, -1);
+			midi_track_write_bank_select(track, 0, t, 0);
+			midi_track_write_control_change(track, 0, t, 126, 127); // Monophonic mode
+			if(t >= 8) { // OPM only
+				midi_track_write_nrpn_msb(track, 0, t, 0, 112); // OPM Clock = 4MHz
+			}
+			midi_track_write_control_change(track, 0, t, 12, 0); // Amplitude LFO level
+			midi_track_write_control_change(track, 0, t, 13, 0); // Pitch LFO level
+			midi_track_write_rpn_msb(track, 0, t, 0, 32); // Pitch Bend Sensitivity
+			midi_track_write_pitch_bend(track, 0, t, 0x2000);
+		}
+
 		struct midi_track *first_track = midi_file_prepend_empty_track(&midi_file);
 		midi_track_write_time_signature(first_track, 0, 4, 2, 0, 0);
 		char buf[PATH_MAX];