So can you confirm if you go into the RC, and sound effects is normal (32/64), the FE sound isn't working properly? Or is it "solved"?
Did you switch back into the RC to check again? Have you tried changing the number of effects to low and high values (then restarting rF2), in both builds, to compare?
yes I have to restart after changing the values, I was at 1, then a restart, and it was ok, sorry, solved. Now I can enjoy the "beauty" sound engine...