EMU_FXWC
emu_wrptr(sc, 0, EMU_FXWC, 0);
ch->setupreg = EMU_FXWC;
emu_wrptr(sc->card, 0, EMU_FXWC, 0xffffffff);
emu_wrptr(sc->card, 0, EMU_FXWC, 0x0);
emu_wrptr(sc, 0, EMU_FXWC, 0);