Yeah Beeps we have always enjoyed the Echo stuff. We have an RME ff 800 too. Lots of pc's doing all sorts of jobs. LOL!
Nah I've never done any chaining before. Never had a reason to. I usually have enough ins and outs to where I don't need to do that.
For example, one of my pc's has just one Layla in it. Another has two Layla's in it for 16 in 16 out. They sync right up.
The other boxes don't need much power anyway...and at the end of the day, I have a Tascam DM 4800 so I have plenty of ins and outs there with loads of power. You can try that optical thing....but you'll need to see which of those is the better clock. I believe my main engineer at the other studio uses that technique. We have a Focusrite pre that runs into the Audiofire 12. I'm not sure how he has that configured. I can call and ask if you want me to? It would only take me a minute?
-Danny