How do I remove music from an enemy being around?

[Tiiwh]

I basically have the same problem. So I hope this doesn't bother anyone that I'm asking this too.
I have my "main map" and my prison map, so I basically placed an enemy in the prison map, and when I enter it I hear the monster right away and the music for it starts, when he is not even close!
I tried to replace it in my main map hps. file, but I guess that doesn't work. Do I have to create a prison.hps file aswell? And when I'm using files such as ogg. to my music the game crashes, it can only handle music from the folder "sounds" in the Amnesia The Dark Descent folder.
Please help!