A_FXRT1
snd_emu10k1_ptr_write(hw, A_FXRT1, ch, temp);
A_FXRT2, A_SENDAMOUNTS, A_FXRT1,
A_FXRT1, 0x03020100,
A_FXRT1, snd_emu10k1_compose_audigy_fxrt1(route),
A_FXRT1, snd_emu10k1_compose_audigy_fxrt1(send_routing),
val = snd_emu10k1_ptr_read(emu, A_FXRT1, idx);