When you hold down the fire button with Gauntlets of the Necromancer, the sound doesn't loop properly. It constantly resets and never finishes. I

It sounds correctly for me, could you please confirm if this bug persists?

Not currently. The best way would be to try another source port. Can you recommend me a source port that is easy to install/compile on 64 bit Linux ? My other favorite, Doomsday, compiles but crashes when starting a new game. I might be able to compile it

OK, I've found the cause of this bug, it seems the engine had a limit of one sound per entity in the game, which IMHO is a bad thing, I've removed the limit and the sounds seem to play better now.