Quote from PrejudicedNanobot on July 27, 2011, 9:24 am

I did place the VPK in that folder for my tests (both current and previous), but the sound cache wasn't automatically updated to include music_test.wav. After I manually updated the cache via the console, however, the sound played fine, so the game must be recognizing that the VPK is there, just not auto-updating the cache to include the sound file contained within.

Did you have a chance to test the VPK I attached? If so, were you able to play the sound without updating the cache manually?