This is a great tool with huge potential I guess, tutorial is great.
I bet it would make it more awesome as it is now by adding also some known music tutorials (not entire tune but a few seconds, split by instruments/channels, explaining how to do each instrument and how to put them together to create the final song.)
For instance Mercury (J. Murphy, Sunshine), Old souls/Time (H. Zimmer, Inception) or maybe some easier musics. Inspiration could also comes from the 80s games like on Amstrad CPC which brings us great chip tunes.
I'm no musician by far (always hate the few lessons I've got in school :P) but still as pretty much everyone, I like music, even creating some in my head, but I would like to learn also how to give them some life with your tool.
Thanks for your work.