I'll probably answer this at the same time as somebody else and have to come back in to edit
, but here's THE ANSWER.
When we (the Kerth Committee) started tossing the idea around about including sounds in the ceremony (Pam, was that the 2nd or 3rd year?? I'm trying to remember for sure...) we went through our list of wavs that we had in our mIRC files. We chose ones that would work for the ceremony "Wow" and the clapping and such, and decided to pull those together as "Kerth sounds." So no, we didn't make them...just gathered them together from sounds we'd already been using on IRC.
There were probably a LOT of people we should credit for the sounds, as they were surely done by a lot of different people. I suspect people with the capability isolated favorite soundbites from the show and started sharing them online. Whenever somebody had something fun and new, I remember we all sharing it and downloading it from each other.
There ya go. That's the history of the "Kerth" sounds.
They were, first and foremost, IRC sounds.