Two thoughts. One, currently when you kill a monster, its pain sound and death sound play at the same time. This obscures the death sound and makes any longtime Doom vets think the baddie is still alive. (In Doom, the killing blow did not produce a death sound.) Could it be altered or config'd to be this way for DoomRL?
Two, when multiple sounds play at once, they get amplified. This results in a spike in volume perhaps far above what you've experienced for the past half hour. Personally it makes me worry for my speakers and that I'm gonna wake everyone up. Could this be looked at too?
I know Doom had some sort of cap on the sounds. i.e., the loudest a sound could be is when it was right next to you. Multiple sounds at once in the distance might amplify it a little bit, but never past the maxsound of point blank. That makes it easier to tell how loud the game is going to be, ever.