Are the devices physically synced to each other in some way?

Update on this one: this often happens when I use external instruments in Cubase. As soon as I remove some of the external instruments (unload them like a VSTi), the sound comes back. When I add them again - the sound is gone.

I just got a completely new system running Windows 11 and the problem is still there. Is there some kind of log functionality that could provide some info about what goes wrong with the RME ASIO driver when something goes wrong?

Hi Klaus,

how do you reset the audio system in cubase? Studio -> Studio Settings -> Audiosystem -> RESET (DE: zurücksetzen) ?

What do you mean by changing the latency ? Changing the ASIO buffersize ? Between what values ?
BTW .. changing the ASIO buffersize also causes something like a reset of ASIO.

Which sample rates and ASIO buffersizes do you use in your project ?
Do you have less or even no problems if you use a higher or maximum ASIO buffersize ?

Does freezing of Cubase tracks with external instruments cure the issue?

Do you play the external instruments through MIDI keyboard or do you have a MIDI track in cubase, playback through external instrument and record it through an analog port?

Which sound goes away? Only the sound of the External Effect? Or the whole sound in the project in regards to monitoring / playback ?

Please detail the setup of the External Effects in Cubase and the HW connections (audio, midi) in each of these different use cases when it works and when it doesn't work.

How is it if you use UCX and BBF Pro alone or in combination (disconnect UFX from setup). This would at least exclude any potential driver issue with the UCX and BBF Pro, but would leave the question, why three interfaces together do not work.

Do you make sure, that all three interfaces are not only clock synched but also use the same ASIO buffersize which is at least needed that you get no offset of recorded audio tracks in the DAW due to different buffer sizes.

Hey ramses,
Thanks a lot for your support!

Yes, I reset the audio system exactly as your described or by changing the ASIO buffersize from 256samples to 512 and back again.

My ASIO buffersize is 256 samples but it doesn't matter which buffersize I use.

Nope, sorry.

Both.

The sound of the whole project. Cubase is completely silent from that moment on. You can still see all the signal levels so visually everything works as it should - there's just no sound. Also, when checking Total Mix there's no sound coming from Cubase to Total Mix. Other applications, for example playing some music in the background via Spotify, is uneffected by that.

Well, it's just a combination of different MIDI and audio I/Os. Nothing changes here. When I load an external Instrument that has it's audio connected to the UFX, it will always work flawlessly. When I load an external Instrument that is audiowise connected to the UCX or Babyface it breaks the whole audio as describes above with a change of maybe 75%. By resetting the ASIO driver several times, I can get the audio back and then this external instrument will also work just fine.

I could give that a try but this will be a bigger change in the setup. I doubt that there's anything wrong with the UCX / Babyface because they work just fine in other situations on their own.

Absolutely. They're always using the same buffersize and are in sync.

Yes. As soon as the inputs from the other interfaces are "involved", chances are that the sound dies.

I did a VERY quick and VERY rough test with only the UCX and BBF Pro and that seemed to work fine. But I could be wrong on that.

Yes, it could be a Cubase related problem and this is the program that definitely causes the most issues (yes, even in a new project, the single usage of the input of the UCX/BBF can kill the sound by just adding an audio track and connecting it to one of the inputs of the interfaces). However I also saw problems in NI Kontakt for example when the outputs of the UCX/BBF were involved. The chances here to get no sound are definitely much lower.
When running DigiCheck in parallel, I can still see the audio input going into the interfaces but no output coming from Cubase.
It's a very weird issue and it happens on at least two completely different PCs with different Windows versions and also across different software versions.

+1 !
And I would suggest Reaper, which is free to download and has unlimited functionality(evaluation period 2months).
Here's a video on how to set up your MIDI and audio tracks:  https://www.youtube.com/watch?v=aQ1iHnkqiXA

You 're welcome!
And I got it about external intruments! I 've been spoiled by Reaper, where every track can be whatever, depending on its Input.
If you watch the video I linked, you 'll understand!

Another test you could try is to change your MIDI connections.
As I don't know your actual setup, I guess that you have a MIDI keyboard connected to the UFX's MIDI Input, and using MIDI Outs from all 3 interfaces to external gear.
What happens if you use the UCX's or BF's MIDI Input, instead?

It still may be a Cubase problem. I suspect there are very few if any trying to do what you are doing in Cubase which is probably why there are no other reports. This rings true especially if it works fine in other DAWs. Steinberg may have invented ASIO but they still make mistakes. I use Cubase and there are plenty of bugs. I only use the one interface though which obviously works fine.

True. I'll post the same question in the Steinberg forum and see what comes up. Will keep you posted - hopefully a solution can be found.

Check (via TotalMix of all connected interfaces) if the sound wrongly gets routed to another output that is not connected to your monitoring system when the sound drops out. Especially check the Software Playbacks vs. the Hardware Outputs.