Hello, i'm a fireface 800 user.
I can loopback all Analog+SPDIF outputs to Ableton inputs, and it's working as a i expect;
but (using the same before path, in this case i copy the "Submix Output AN 3/4" to the ADAT submixes), if i'm trying to loopback the ADAT's outputs to Ableton inputs, it will doesn't work.

I would also attach you a screenshot to maybe understand little bit more my problem:

TotalMix AN 3/4 --Loopback--> Ableton Ext. In 3/4
TotalMix SPDIF --Loopback--> Ableton Ext. In 11/12
TotalMix ADAT 1/2 --Loopback--> Ableton Ext. In 13/14
TotalMix ADAT 3/4 --Loopback--> Ableton Ext. In 15/16
(and as you can see, there no sound in the Ableton "Ext. In 13/14" & "Ext. In 15/16")

thank you in advance, luca.