Nice app. I find the overall color of UI elements to be a little too dark. Right now with a little room light reflections on my iPad I find it hard to see some parts of the UI.

The biggest issue I have is, unless it supports CoreMIDI that leaves anything I create trapped in the app and makes it much less interesting and useful to me as a music creation tool. It also rules out using it in conjunction with all the other music apps out there. I would really encourage looking into this and it is something I would probably pay for to enable.

Also I don't (and won't) use Facebook so that rules out any sharing, etc... for me. I'm not opposed to sharing features at all, I just won't use Facebook to do so.

edit: a word