Dlc music too quiet

[K33industries]

Hello my name is K33industries.
I like the game very much and have meanwhile spent many happy hours with it, but why is the dlc music so quiet in contrast to the standard music?

Wouldn't it be possible to adjust the volume to the vanilla music.

Every time the new music starts you hear almost nothing.

I think that's a shame because I like the song String theory, for example, but I can hardly hear it without increasing the volume from 10% music to at least 60%.