Hldj not working?

I have hldj set up for all my steam games and Gmod is the only one that doesn’t work. It loads up fine, and the server has it enabled because others can play sounds.
When I press the play audio key, it loops GAME sounds (shots fired, people on mic, etc.) over and over and distorts them (which is really, really useful to troll the shit out of little kids on DarkRp).

Any reason why this is? Maybe the server doesn’t have sv_allow_voice_from_file enabled and the players on the server are using a different program to get around it.

Yeah, the latter seems to be the reason, what program can I use to get around this? I don’t intend to spam, I use it on DarkRp servers as a DJ.

HLDJ is disable on garrys mod and tf2