EMU_CHAN_CPF_PITCH
emu_wrptr(sc, v->vnum, EMU_CHAN_CPF_PITCH, pitch_target);
emu_wrptr(sc, v->vnum, EMU_CHAN_CPF_PITCH, 0);
emu_wrptr(sc, v->vnum, EMU_CHAN_CPF_PITCH, pitch_target);
emu_wrptr(sc, v->vnum, EMU_CHAN_CPF_PITCH, 0);