Rebuilding the stock sound.lvl files

[Giftheck]

I'm trying to rebuild the sound/shell.lvl file, but when I add a new line to my soundmunge.bat and munge, though I get a shell.lvl in my sound folder that appears to be the right size, I place it into the folder and I get absolutely no sound on the menus at all when I open the game.

[Giftheck]

Okay, so I've managed to load my own music but the configs don't seem to be working at all. The music on the menu will simply ignore what I've defined in my config and play the same piece repeatedly no matter what screen I choose.