Since I started, recently, to take a real interest in mixing things, I immediately saw that there is a good amount of people out there eager to sell audio mixing tutorial and packages of all sorts. Some might be good, some might using the advertisement campaigns to promote not-so-good contents. Some do send (very) regularly to your mailbox dubious promotion of products disguised as information. Now, some of these people might actually have solid learning material and are using a common ad system for lack of better ways. I do not know. What I have found, though, are the resources for Mike Senior's book Mixing Secrets. There is a large number of session files that can be loaded in Ardour (and other DAWs since they are simply wav files). For beginners such as me, to intermediate to advanced, covering a wide array of musical styles, from sessions consisting of a single track to full-blown sessions of 60+ tracks. There are so many styles represented that one will find a few tracks closer to his/her own liking. Even then, for general mixing practice, the ground covered is very generous. Moreover, there are discussion groups for many of those tracks where people upload their mixes and talk about them. And new tracks are being added from time to time. There is no need to buy anything at all. I would recommend the book though, even if its 'Secrets' catching title might be too tacky, it is a book whose goal is to establish a good understanding. There is a lot of substance, not only tricks or 'secrets'. I hope I'm not sounding like an advertisement (must say that I read a fair share lately ! :) This is a great place for anyone interested in trying out some mixing practice, throwing your plugins at it (mixing god forbid !), etc. http://www.cambridge-mt.com/ms-mtk.htm Cheers.