emu_vtrigger
emu_vtrigger(sc, v->slave, go);
emu_vtrigger(sc, ch->master, ch->run);
emu_vtrigger(sc->card, ch->master, ch->run);
emu_vtrigger(sc, v->slave, go);
void emu_vtrigger(struct emu_sc_info *sc, struct emu_voice *v, int go);