@SpaceInvaderOne I actually added the MB audio because that's the only chance I had in previous tests to have audio working. It works, I have the sound on.
However, I have now an even worse issue, my GPU is not detected in my VM anymore. I clean reinstalled my VM because I switched my VM drive, everything was working fine and all, I installed my Nvidia drivers. My GPU was detected until (I suspect) I added the MB audio to the VM config, which i forgot because I realised I had no sound, but since then I am unable to see my GPU in my VM. I realised that everytime I change of video/audio in my VM config, the next time I run the VM nothing works as it used to be, even when I revert the changes. I usually keep a copy of my xml config file before any modif, but this time I forgot, and my GPU is gone.
Do you think you can tell me if you see something wrong in my config please?