This is a funny app, but they are all the same sample played at different rates.
What we really "need" is the ability to play something like (or better, exactly like) the infamous keyboard on "Ferris Buellers day off".
Watch the movie to see what I mean.
Build a keyboard with real samples at those octives, variations and a cough keyboard and youll have a winner, at least from my crude humour books! :)
skippingrock about Burp And Fart Piano, v1.0