Audio output from one qube as mic input for another vm?

[throwaway20]

I am always attaching a specific usb microphone for videoconferences, and I am wondering if I could feed as less data as possible to the applications running on the same qube (e.g. Zoom, Skype) about it.

I was thinking of making a middle-man qube between my usb mic and appvms. It should get the mic input through sys-usb and output its sound using a loopback module. My audio input would travel this way:

[sys-usb -> audio-filter -> work-zoom]

Is it possible, then, to route a specific vm’s audio output to another one’s audio input, so it appears as a generic microphone at the end?

I am aware there is “dom0:mic”, but it’s only useful if I had a mic with a 3.5mm audio jack.

[eclaeys]

I think this might cover what you’re looking for

Audio qube

An audio qube acts as a secure handler for potentially malicious audio devices, preventing them from coming into contact with dom0 (which could otherwise be fatal to the security of the whole system). It thereby mitigates some of the security risks of using USB devices and Bluetooth devices. Nonetheless, we strongly recommend carefully reading the security warning on USB input devices devices before proceeding. With an audio qube, many kinds of devices can be used (that previously were eit…