You still haven't said the Pi model you're using, as asked in https://retropie.org.uk/forum/topic/3/read-this-first. Can you please add that info ?

You need to configure the Audio:

first in the RetroPie system, by opening the Audio entry there and choosing Headphones as your audio output next in EmulationStation's menu, under the Audio sub-menu, choose the default card to be either PCM or Headphones.

The fuse package hasn't been updated in quite some time. Unless you had a very old version, any recent update wouldn't have changed anything in the emulator.

Are you using the standalone emulator or the libretro core (lr-fuse) ? Please add some info about your setup, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first.

Thank you very much, everything works now!