Episode 2 Characters Doesn't Talk

Episode 2 Characters like Alyx, Kleiner and GMan doesn’t say anything, nor cause any subtitles or sounds. What’s going on? Had this bug over an year and it still remains.
They do talk in HL2, but doesn’t cause subtitles.

GMod 12.

Garry’s mod was never meant to be played on episodes 1 or 2. So the animations and scenes are very buggy. And no, there is no fix until Garry can get around it.

Garry’s Mod wasn’t ment to play any of the games you can mount. It’s for the maps and content, not to actually play them.

Get obsidian conflict if you want to play them multiplayer.