snd_opl4_note_on  222 sound/drivers/opl4/opl4_local.h void snd_opl4_note_on(void *p, int note, int vel, struct snd_midi_channel *chan);
snd_opl4_note_on  103 sound/drivers/opl4/opl4_seq.c 	.note_on =		snd_opl4_note_on,