EMU_FXBA
emu_wrptr(sc, 0, EMU_FXBA, 0);
emu_wrptr(sc, 0, EMU_FXBA, 0);
ch->basereg = EMU_FXBA;
ch->basereg = EMU_FXBA;
emu_wrptr(sc, 0, EMU_FXBA, 0);
emu_wrptr(sc, 0, EMU_FXBA, 0);