Skial

I'm in the same boat. :(

I've tried twice in the past couple weeks to get a custom uber sound to work. No dice.

I just followed this and it worked:
To use a custom hitsound, download one of the sounds from here and put it in your tf/sounds/ui folder.
If the folders don't exist, make them.

Note: Make sure the sound file is named hitsound.wav

I havent made sounds in a wgile. What someone said should work unless an update broke custom stuff.

I tried what Someone said on 2 different servers (Orange and Jailbreak) and neither worked, but I'll try deleting my custom folder.