Combine Soldiers not emitting sound

I’m trying to work with a script that replaces combine soldier’s sounds based on their model.

I’ve managed to replace pain and death sounds, but the sounds in npc/combine_soldier/vo/ are not returned by the EntityEmitSound hook.

I’ve tried printing all emitted sounds to the console, and none of the combine chatter sounds appeared, despite playing ingame.

Any ideas?

Can you play those sounds ingame? like if you were to use EmitSound(). Perhaps it has to do with the audio file format…

Yes, the sounds all work ingame.