an interesting thing happens when you run the headphone jack of a kaoss pad into its mic input on effect send mode. you get drum sounding feedback minus the screeching noise. the key part is that its effect send mode or else it wont be listenable and it will piss off your neighbors
http://www.box.net/shared/42sxdq5kag
enjoy ( you may have to mark the samples because the wave converter nullifies the editing)