Failed to load sound "vo\null.wav", file probably missing from disk/repository

[Ze Ubermensch]

http://pastebin.com/raw/C37grh8w
I believe somewhere in development TF2 changed it's null sound file from "null.wav" to "null.mp3".
I find some new maps are still using the old soundscripts, which can be mildly annoying when you are trying to do some console stuff and there's this error message popping up once a second.
So use this new script pls

[879m]

Valve did switch the audio from .wav to .mp3 a while ago, but I always thought this was from using a nosound rj cfg.

[CheeseMaster]

I have a question, where do I place this script? Into my soldier.cfg or autoexec.cfg?