hldj.org

HLDJ in Half-Life works.

But when I play Sven Co-op , it is a Mod Game of Half-Life.
It can't play any audio in-game , HLDJ seem not support the Mod Games.

It's always supported HL mods, read the stickies, manual, etc. and make sure you're doing it correctly.

Thanks , it finally works in SvenCo-op.
I found the Game Option of Advance "Use alternate Game Audio" shouldn't be choose.