FXRT
snd_emu10k1_ptr_write(hw, FXRT, ch, temp);
FXRT, MAPA, MAPB, ENVVOL, ATKHLDV, DCYSUSV, LFOVAL1, ENVVAL,
FXRT, 0x32100000,
snd_emu10k1_ptr_write(emu, FXRT, voice,
snd_emu10k1_ptr_write(emu, FXRT, voice,
val = snd_emu10k1_ptr_read(emu, FXRT, idx);