New update!

Now the songs should also work in other L4D2 campains as well aside from the original ones, just like the campaings from the first game, Cold Stream and also Last Stand!

Lowered volume of the songs, clips less.
The reason for the previous version being too loud is because...at least in my game, the SFX are too loud and the music gets too silent, but will leave it more clean here until is asked otherwise.

Light changes of a few sounds due testing stuff