As a side note, there are many of such threads in the RME forum, where the gory details of clock synchronization and TM FX routing have been explained already in detail.
In terms of the physical setup:
- both external devices (Behringer, Focusrite) have ADAT inputs, so they can get clock synchronization via ADAT
- your ADA8200 supports only single speed, so you need only one TOSLINK cable per device and transfer direction
So, you need in total 4 TOSLINK cables, 2 per device to perform proper cabling:
Digiface USB (clock master)+---ADAT1 OUT------->-audio+clock-----------ADAT IN---+ADA8200 (clock slave via ADAT)
+---ADAT1 IN---------<------------------------ADAT OUT---+
+---ADAT2 OUT------->-audio+clock-----------ADAT IN---+Focusrite 18i20 (clock slave via ADAT))
+---ADAT2 IN---------<-------------------------ADAT OUT---+
On the ADA8200, you need to check the DIP switches to configure the clock and from where the device gets the clock.
On the Focusrite - if I remember right - you configure the clock via the Mixcontrol application.
ADAT supports 8ch per link, the DIGIface USB has 4x ADAT I/O = 32ch in and out.
In TotalMix FX, the mapping of ADAT channels is as follows.
- ADAT1: ch 1…8
- ADAT2: ch 9…16
The channels of the other two ADAT I/O ports are currently of no relevance, you do not have anything connected to it.
Check in the RME driver settings, that you see under "Input status" (or similar) that the devices connected to ADAT1 and ADAT2 are in status "sync". This means you receive a clock synchronized signal from them.
By this, you validate that they are configured as clock slave and send a clock signal back which is synchronized to your clock.
Audio coming from the Behringer you will easily see in TotalMix FX on ADAT1…8 IN.
Audio coming from the Focusrite you will easily see in TotalMix FX on ADAT 9…16 IN.
In TotalMix FX, check that you are in submix mode (routing mode submix):
To send audio to the Behringer, click to any of the HW outputs ADAT1…8 OUT
OR
To send audio to the Focusrite, click to any of the HW outputs ADAT9…16 OUT
AND THEN
move the faders of HW inputs and SW playbacks (audio from PC/applications) as needed to create the submix for each of the HW outputs individually.
On the Behringer there will be a fixed routing, that Audio from 1st ADAT channel goes to the first analog output and so on.
On the Focusrite the routing might be a little more flexible, you need to fine tune it to your demands.
More information about TotalMix Setup and Routing, check this sticky posting:
https://forum.rme-audio.de/viewtopic.php?id=34394
Check all information resources, you get all the needed information from there.
Don't worry too much, Rome has not been built in a day as well, take your time.
Once you understand the basics, all will be much clearer and easy to operate.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13