Ooops... I was experimenting with soundscripts. I was wondering why they wouldn't work, when I found chicken's post in this forum saying that everything in dlc2 overrwrites base game stuff. So I just copied my edited game_sounds_manifest to the dlc_2 folder, and chose the option to delete the game_soumds_manifest there without thinking.

Now, the game can't find the Cave Johnson multiverse lines. Would someone be so kind and copy his game_sounds_manifest.txt out of the dlc_2 folder here?

There you go ;D

You can also verify game cache to get all modified files back to their original state (unless you were trying to avoid that).

Thank you