The setup is the following: Zoom running inside a Lubuntu VM. USB headset reassigned to the VM.
The problem: only in Zoom, the speaker of the headset does a crackling noise. (E.g. youtube music is clear. Using Skype outside of the VM works fine. Listening to Zoom on the laptop's built-in speaker works too.)
Restarting pulseaudio does not fix the problem.
Question: Where to start with debugging this? Is there some log that might show an error message, or some other useful information?