I started this thread (https://forum.rme-audio.de/viewtopic.php?id=31361) a few years ago when I got my babyface FS and apparently I must've had it working back then...or at least I thought I did.  I never really ended up using a lot of the IO so for the past couple years the FF800 has been off in the rack. 

Lately I had a need for the extra IO and some hardware sends so I tried getting this back in place and *WOW* did I need a refresh on all things RME/TFX.

For those that might follow my footsteps, I think I finally wrapped my head around all this and have things working as I need them to.  I have the FF800 hooked up via firewire for now but it is flashed and can act as a standalone interface and all I would miss is any additional routing I'd want to do and/or phantom power on the mic pres 7/8. 

Here are the connections:

Babyface Pro FS

Inputs
1 – Desktop Mic
2 – Studio Mic
3 –  HiZ
4 – HiZ

Balanced Line Outputs
1/2 – Mains
3/4 - Phone

ADAT @44 (Master)
Adat in from Fireface Out
Adat out to FireFace In

ADAT In
ADAT 1 – HiZ Return
ADAT 2 – vChannel Return
ADAT 3/4 – ProVLA Return
Adat 5/6 – Keyboard

ADAT Out
ADAT 2 – Send to Voice channel
ADAT 3/4 – Send to ProVLA

Fireface 800

Front Panel Input
1 – HiZ (set to front in TM)
7/8 Preamps (9/10 not usable due to ADAT)

Rear Panel Inputs (Balanced TRS)
1 – Unavailable
2 – Hi Z Return
3 – Voice Channel Return
5/6 – PRO VLA II Channel2 Return
5/6 – Keyboard

Balanced Line Outputs (Rear)
2 - Voice Channel Send
3/4  – ProVLA Send

ADAT @44 (Slave)
Adat in from Babyface Out
Adat out to BabyFace In

ADAT In
ADAT 1 – Receive from ProVLA
ADAT 2 – Receive from V ProVLA LA
ADAT 3 – Receive from Vchannel

ADAT Out
ADAT 1 – HiZ Return
ADAT 2 – Voice channel Return
ADAT 3/4 – ProVLA Return
ADAT 5/6 – Keyboard Return
ADAT 7 – Preamp 7 (set to front in TM)
ADAT 8 – Preamp 8 (set to front in TM)

In TotalMix, the babyface is set to do nothing by default.  If I look at the matrix it's blank.

The FF800 is set so that the analogs and adats match up (this was a huge piece I was missing and causing extra confusion).  I had to plug things in carefully to ensure that everything lined up on the same number channel so it makes more sense when I'm only using TFX on the babyface.

Unfortunately I can't upload a pic here for my matrix view but I will also post this on the facebook forum in case anybody finds this useful.