gus_set_volume   1701 dev/isa/gus.c  	gus_set_volume(sc, GUS_VOICE_LEFT, sc->sc_ogain);
gus_set_volume   1702 dev/isa/gus.c  	gus_set_volume(sc, GUS_VOICE_RIGHT, sc->sc_ogain);
gus_set_volume    354 dev/isa/gusvar.h void	gus_set_volume(struct gus_softc *, int, int);