[LAU] ADAT support with Presonus FireStudio Live interface?

Hello I have two Presonus FireStudio Live firewire interfaces working in daisy-chain mode for a total of 16 channel pre-amped inputs and they are working great :-) I am however sometimes running short on channels and thought it might be worth looking into adding a cheaper interface, such as the Behringer ADA8200 Ultragain, and hook that up to one the the Presonus interfaces through ADAT to ensure full sample synchronization. I have not been able find anything information on how/if this kind of setup would work on linux and the ffado website seem particularly sparse with information these days. Does anybody have a similar setup and can share some insights into what works and what doesn't - then it would be much appreciated :-) In particular I would be interested to know how/if the extra channel from the ADAT interface would show up in jack? Kind regards Bent Bisballe Nyeng