When flying F-45, most sound effects are practically unauidable, though you can hear them if you crank up your volume to the max. The only unaffected parts are the MP3 player switches and music playback. This is gamebreaking when trying to fly F-45 since sounds are paramount for many aspects of flying and fighting (Sidewinder lock growl, RWR lock and missile launch warnings etc.).
Select F-45 and enter any mission. Observe lack of sound while interacting with the cockpit (flip switches, turn on engines etc). Click on the MP3 player buttons to hear sound at correct volume.