@masterofthardus Simple sound issue fix steps are:

Windows key > type: Control Panel > Open > Sound > Playback > select the Device you use: Configure > Stereo > finish configuration, Properties: Enhancements > Disable all enhancements, Advanced > no higher than 24 bit, 48000 Hz, Spatial Sound > Off, Restart or Shift+Shutdown (not just Shutdown) of PC

If your headphones come with any applet/program, then you may want to disable that & try using the headphones without it. Similarly, if they use a USB or Bluetooth dongle to connect to the PC, see if you can connect directly without the dongle.

If none of that helps nor the troubleshooting help on the page arma linked, then you may want to think about installing a 3rd party device/driver like VoiceMeeter or VAC.

c:\program files (x86)\thq\gas powered games\supreme commander - forged alliance\gamedata\ambience.scd

Looks like this file is missing ?

Please reinstall your game to c:\program files (x86)\thq\gas powered games\supreme commander - forged alliance\

Also delete ALL files inside this folder:

C:\ProgramData\FAForever\gamedata

Then try again.