Really sounds (sorry) like you want a hardware solution. Not sure what a linux specific solution would be.
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exactly! The device you posted has an usb connection. I would connect this to the main machine. But I am not sure if the device supports linux on that conenction. From my point of view I could also go with a soundcard which alows digital line-in and mixing. I guess something like this would work: https://www.amazon.com/Creative-Streaming-Programmable-Surround-GameVoice/dp/B0BXFV6Q1T/ref=sr_1_33?keywords=sound+blaster+7&qid=1686692956&sr=8-33
but the sound blaster does not properly work on linux
Maybe I'm misunderstanding but this is best achieved with an analog mixer. You already have the ideal solution for your requirements.
I agree with the other answer suggesting to keep the mixer. Maybe look into a higher grade cables if the interference is induced into the analog cables (it could also come from the sound card, cables won't help with that). That way you could get rid of the optical to analog conversion.
Just as an other option I wanted to mention Deej though. You'd likely need two deej controllers but they could be built into the same box.
Ohh very interesting, thank you.
The problem is, I am currently using something like this for the mixing:
https://www.thomann.de/intl/the_t_mix_mix_502.htm
When ever I touch a cable I get buzzing.
Now I found this:
https://www.avermedia.com/us/product-detail/AX310
This looks exactly like I want it, but relies on software whitout Linux support