Sorry, this doesn't explain submix mode or how to validate a routing/submix; therefore, it might be confusing for him.

After a total reset of TotalMix FX, like explained above, it is useful to provide
A) a basic setup / routing and
B) to inspect/adjust the routing of your monitoring outputs (monitors, phones).

For everything mentioned below, keep in mind, that every hardware output has an individual routing.

to A) Here's a quick basic setup

1. Options -> Reset Mix -> Total Reset
2. Click "Assign Button" to assign
    - HW Output AN1/2 to "Main Out"
    - HW Output Ph3/4 to "Phones 1"
3. Options -> Reset Mix -> Straight Playback with all to Main Out
4. Store this routing to Snapshot 1 and rename it to "Monitors 1"
5. Resize and position your TM FX window on screen to your liking and store this to a Workspace
    File -> Save Workspace As
    The workspace includes not only the TM FX routing but also the size and position of the TM FX window on your screen.
6. Additionally store this to the first of 30 so called Workspace Quick Select slots.
    File -> Workspace Quick Select
    The purpose of this is that you can now quickly restore Workspace Quick Select Slots 1..9
    by the key combination ALT-n (n=1..9), for Apple this is the Option key on the Apple keyboard

By point 5+6 you can now at any time come back to exectly these settings by either loading the workspace from disk
or by simply pressing ALT-1 (in this case).
You need to repeat step 5+6 whenever you are making changes to the routing or channel description or if you resize or reposition your TM FX window.

Now TM FX is reset and a standard routing (all sw playback channels = audio from PC) is provided to "Main Out" (HW Output AN 1/2).

to B) check / inspect the routing for a selected HW output/submix

Play some music for a test. You should see audio arriving in the middle row, most likely on SW playback AN 1/2.

Check that submix mode is enabled (usually the default routing mode of TM FX).
You find it in the light blue area on the top right side of TM FX window.
Validate that under Routing Mode "submix" is selected (lit), not the routing mode "free".

1. Select the HW Output "Main Out" (AN 1/2) in the TotalMix FX control room.
    Note: you see now AN1/2 at the bottom of each fader in top/middle row to indicate this is the routing for submix AN1/2.

2. Check the routing by inspecting the fader position of Top Row (HW inputs) and Middle Row (SW Playbacks, audio from PC)

3. It's helpful to press/toggle the button "sub" on the right side under "Layout Presets".
    With "Sub" activated you only see those channels from the top/middle row that route audio into the selected HW output.

More information

More information about TotalMix FX and links to further information resources, also to useful YouTube tutorials, see here:
https://forum.rme-audio.de/viewtopic.php?id=34394

Firmware should be 226
You should perform a firmware update.
as you could read out the firmware number I expect the driver is working and a firmware update will work.

Download the FUT and run it

You need to place it to a cloud. Nobody can (luckily) access files on your computer.

Details see here and why I propose Dropbox: https://www.tonstudio-forum.de/blog/Ent … rum-EN-DE/

See also my added pictures in my posting above to clarify my statements and to put examples.

You are in the wrong TotalMix FX operational mode.

Do not use "DAW mode", use "Full mode" instead (which is the default).

See Options -> Operational Mode

In DAW mode you have no middle row (SW playbacks) and are very limited in terms of direct routing of flows on the card in near realtime. Then every audio flow has to be routed through the DAW. And this adds much more latency over USB, the higher your buffers the higher your latency. This is much more compared to converter latency alone.

No wonder that nothing worked. Then also audio to the headphones needs to be routed through the DAW.

Please use the normal operation mode "Full Mode".

Set the Babyface to clock-mode external optical.

No, audio signal and sync is by the same toslink optical cable.

One cable is one way sending or receive.

i tried both , neither works. Babyface and steinberg  are set to adat of course and both at 44KHz...for the steinberg i followed those instructions (https://www.youtube.com/watch?v=Xiqw9ihuQpw)...I put a mic on input 3  of steinberg that should come out in adat3.. But no signal is seen on the babyface..The only sign is that the adat channels appear in tM

You need to change dl=0 to dl=1 in the URL if you use img tags, so that the picture is shown directly.
Otherwise it is not even clickable.

I did this now for you.

There's nothing connected....

Or the cable is defective ... at the end he needed to check.

Now he might only have a routing problem on the Steinberg recording interface, that no channels are being routed to ADAT.

thanks Ramses for posting the pic and explanation
Here is what my TM windows looks like with the adat 3 assigned

Hello
Something strange  is happening since yesterday  ( hopefully after my recording session) : my left in channelis much weaker than my right although i have the same gain. Left channel ( number) is barely audible. I tried different  level of gain ( same for 1 and 2 ) with same mic but the difference is always important

i don't see why as it seems that TM configuration is the same..;except that in channel 2 next to 48 v button an instr buttpn appeared..see below.Any clue please?

Thanks for the answer
i used the same mic switching physically from channel 1  to channel 2 ..
I suspect that there is an issue with phantom powering , i'll try a dynamic mic tonight

yes you were right Kubrak , it comes from the cable ..The connection are ok on the xlr side but there lust be a problem on the connector's side becomes the sound comes and goes as i move it