snd_gf1_interrupt_midi_in
gus->gf1.interrupt_handler_midi_in = snd_gf1_interrupt_midi_in;
if (gus->gf1.interrupt_handler_midi_in != snd_gf1_interrupt_midi_in)
gus->gf1.interrupt_handler_midi_in = snd_gf1_interrupt_midi_in;
snd_gf1_interrupt_midi_in(gus);