a great IDEA! I saw something like a demo for this on the iphone on youtube, maybe you can get some ideas from that as well. oh yeah it crashed on me while i was just mashing on it then switching from portrait to landscape a few times, it inevitably just muted itself. Some other ideas besides multi touch would obviously be input of your own sounds (unless I'm missing how to do that), better landscape support (letting it go straight across instead of having to scroll down), loop button, etc.
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