I see good PDF manual for Qtractor but not much tutorials online. I like OSS but do not have much money, so I donate time instead. I wonder if you interested in setting up a Wiki for Qtractor and other tools. Although PDF covers well I think it helps if people also have online reference. Anyway, if you interested I can help editing Wiki, just a thought. I have edited Wikipedia and one other Wiki for a OSS project before, so I know how to edit well. But I won't lie, I can't host it :) Not a super good offer, I know, but maybe it could help people, even if it is close copy of PDF.