[Powerlord]

How would you expect TF2Items to do this anyway? Last I checked, the override value alone doesn't tell you which sounds will be used instead.

But yes, Valve only processes scripts/game_sounds_mvm.txt, scripts/game_sounds_vo_mvm.txt, scripts/game_sounds_vo_mvm_handmade.txt, and scripts/game_sounds_vo_mvm_mighty.txt if the game mode is MvM. This is to avoid overflowing the Sounds precache table, which was causing crashes in any mods that precached more than a few sounds after MvM was introduced, such as Freak Fortress 2.

You might be able to write an extension to process those files.