Verified answer

http://itunes.apple.com/WebObjects/MZStore.woa/wa/...

This itunes link Has all the iPad apps from the commercials... Leading me to believe you're looking for stomp box

I was looking for the Dino app which I found on this link (whilst also finding your question)

Sorry I saw it but don't recall the details, here;s a page showing some of the numerous iPad / iPhone musics apps that might include the answer to your question.

http://nextipad.net/ipad-music-application/

I havent seen it..but maybe garage band..? Thats on alot of commercials because its popular..

its apple's very own garage band app for iOS deiveces i believe

Not sure.. I recommend google. good luck!