F1 2013 Sound Options stuck at 50%, AGAIN!

[nullsys]

Once again (seen in previous F1 versions), the audio can not be reduced below 50%.
So why even have a slider that suggests that scale.

I've looked through some config files, but I can't find a fix.
Does anyone know of a mod/config for this?

 

[ricou]

I have the same problem but back to front, has knowledge that the sound of my f1 is too low(weak) part report(relationship) in the ambient noise. And I did not still find the solution.