aerofly R/C 9 & 8 no music

  • I'm trying to enable the background music on aerofly R/C 9 on an Intel Core i9 2019 MacBook Pro (I have the same issue on R/C 8).

    Pressing the M key doesn't do anything like Q for example, which turns on/off the sounds normally.

    I checked the folder "/Applications/aerofly RC" and the MP3 are there, and playable with a media player.

    Has anyone else encountered this?

    I tried adding more MP3 files in that folder but nothing changed.