EMU_A_CHAN_FXRT1
emu_wrptr(sc, ch, EMU_A_CHAN_FXRT1, 0x03020100);
emu_wrptr(sc, v->vnum, EMU_A_CHAN_FXRT1, v->fxrt1);
emu_wrptr(sc, v->vnum, EMU_A_CHAN_FXRT1, (v->routing[3] << 24) |
emu_wrptr(sc, ch, EMU_A_CHAN_FXRT1, 0x3f3f3f3f);