Made this from a shaker + clap loop, putting into a tape delay and firing up the feedback real high, and after that automating the filter in the delay to control the pitch.
(if you're going to try this yourself, make sure you have a heavy limiter / compressor on the track, or you'll blow your speakers out of their body) ;)
Newgrounds accounts are free and registered users see fewer ads!
I love this loop! It's very inventive and experimental.
Please contact me if you would like to use this in a project. We can discuss the details.