Did you check clock settings for synchronization?
For the AIO open driver settings, check that clock source is set to internal, so that the AIO is clock master.
Then for the Behringer you have jumper at the device, check the documentation for the correct jumper settings to get the clock signal from ADAT.
[clock master] [clock slave]
clock source = internal jumper settings to get clock from optical
AIO---ADAT OUT-------------------[audio+clock signal]------------>ADAT IN---ADA8200
\---ADAT IN<---------------------------------------------------------ADAT OUT---/
General information about clock synch, see my blog:
https://www.tonstudio-forum.de/blog/ent … ios-en-de/
Please post a screenshot of RME driver settings window and a picture of a back of the Behringer,
where one can see the DIP switch settings and the description of the switches.
The Behringer manual is $%!&/&$ ... I didn't find an easy overview about DIP switch settings...
Even if these units are cheap, the documentation could be better.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14