We have updated the version and fixed the issue. Please update and report back if it's now working.
Thank you for your quick update.
The “Sound Volume” works perfectly. Functional fix.
For the "extras volume" and the "vario sound", I can't tell you, I have no idea what it is.
I would like to take this opportunity to say that it would have been great to be able to hover over an option and have a window showing us in detail exactly what it corresponds to. (as with all menu settings, by the way, there are a lot of things in the menu that you can activate/deactivate or vary, and I have no idea what this may affect in-game).
I admit that I never modified the sound in the simulator.
I use the keys on my keyboard to modify the system sound.
Personally, I have a virtual mixer. (voicemeter) And I can adjust each channel, but once I set the volume of each audio output, I then manage the game volume directly in each game.