OK maybe I am with stupid, it is the first MOD I install in CoD but the engine sounds of the Bf109 and Spit do not seem to work.
Everything was installed correctly, I see the new pictures on the screen.
I checked by running launcher with the -dump option and looked at which files are loaded when flying a Bf109 (in the _dump\$core\samples directory).
It loads files (so it is working) but none of the Daimler.wav sound objects.
Did anybody have bigger success than me?
EDIT: SOLVED! I had removed the whole directory instead of removing only the .fmb
Nice sounds!