Navaids ID: vor or ils or adf are not heard when selected in the audio panel.
Aircraft tested: C172, Q400, B737 and SH60
Aircraft within a few meters from the transmitters.
Tried different sites: Lanzarotte, SFO
Resetted my FS4 file in the documents folder.
Checked my fs4 files with Steam.
Engines sound is not a problem.