void snd_midi_process_event(snd_midi_op_t *ops, snd_seq_event_t *ev,
snd_midi_channel_set_t *chanset);
void snd_midi_channel_set_clear(snd_midi_channel_set_t *chset);
void snd_midi_process_event(snd_midi_op_t *ops, snd_seq_event_t *ev,
snd_midi_channel_set_t *chanset);
void snd_midi_channel_set_clear(snd_midi_channel_set_t *chset);