Music App Review - Audio Mastering for iPad
... "As explained by Bob Katz (one of the most respected mastering engineers in the world) in his excellent book on the subject, mastering is both an art and a science. It can also involve a whole range of different audio processing options. It would perhaps be unfair to expect a $9.99 app to cover all the possibilities but Audio Mastering manages to pack in a decent suite of tools given the iOS format and the price."