I thought it was 3rd party?
https://www.airmusictech.com/product...2#.XS2_ci2ZN24
Either way it's dreadful. I can't see an easy way of, say, throwing a home made kick drum sample in there. You can't just drag it in from the edit page, presumably because that would be way too easy for the user. So you have to navigate the file management screen, which is just awful, way too small and can't be resized. I'd hate to have to try and build my own multi-layered instrument on it, put it like that.