I didn`t play for a while. Now I wanted to start again and realised some sound fx e.g. ship movement sounds are missing. I can still hear music and UI sounds. It worked well the last time I played.

I did verify the game files without success. In the game settings the sound volume is on of course. Also I tried to delete prefs.ini without success.

I found nothing on the forums about this, but some guys on steam forums have the same issue: http://steamcommunity.com/app/226860/discussions/1/365172547945917949/