Sorry if there was report of this anywhere else but couldn't find it.
I did a Windows 10 update this weekend and since then it seems my Discovery Freelancer game has no more sound, except some Sound FX (like laser bursts) that sort of work.
I already tried to reinstall Freelancer and the mod but it didn't help. I also went on the device manager and right click on audio : update driver, same thing.
Edit : If this helps, the weird thing is that the Freelancer volume doesn't even appear in the volume mixer of Windows. It used to work without any issues before the update.
Just an update if anyone is having this issue, I managed to fix it.
Some other game required me to install the Windows Media Feature Pack and on the latest updates of windows, you also have to manually activate in the Apps / Programs tab.
After installation of this sound works again in Discovery.