EMU_CHAN_IFATN
emuxki_chan_write(&card->config, i, EMU_CHAN_IFATN, 0xffff);
emuxki_chan_write(&card->config, chano, EMU_CHAN_IFATN,
#define EMU_CHAN_IFATN_FILTERCUTOFF EMU_MKSUBREG(8, 8, EMU_CHAN_IFATN)
#define EMU_CHAN_IFATN_ATTENUATION EMU_MKSUBREG(8, 0, EMU_CHAN_IFATN)