EMU_A_SPDIF_SAMPLERATE
tmp = emu_rdptr(sc, 0, EMU_A_SPDIF_SAMPLERATE) & 0xfffff1ff;
emu_wrptr(sc, 0, EMU_A_SPDIF_SAMPLERATE, tmp | 0x400);
emu_wrptr(sc, 0, EMU_A_SPDIF_SAMPLERATE, EMU_A_SPDIF_48000);
spdif_sr = emu_rdptr(sc, 0, EMU_A_SPDIF_SAMPLERATE);
emu_wrptr(sc, 0, EMU_A_SPDIF_SAMPLERATE, spdif_sr);
#define EMU_A2_SPDIF_SAMPLERATE EMU_MKSUBREG(3, 9, EMU_A_SPDIF_SAMPLERATE)