Powerslave / Exhumed is a Build Engine 2.5D FPS developed by Lobotomy Software. Saturn and PS1 versions exist but they are almost entirely different game. This page is for the DOS version of the game.
I added unused sounds. Who's next sounded out of place so I replaced it with another one. Furthermore, I extended the torch sound and you can hear it burning.
Doesn't work with BuildGDX when I place it in autoload folder.
Update: renaming the archive from "improved_sounds.3.zip" to "improved_sounds.zip" seems to have helped.
Update 2: my previous statement was premature, I guess. The "Who's next" still plays, so I don't really know if this mod works or not.
The mod was intended for raze but you have to extract the .VOC files and place them next to STUFF.DAT which was written in the readme.txt.