I spent a very long time looking for an app that would allow me to bring in songs from my iTunes library and set them up to loop so that I can learn meticulous guitar parts section by section. The ability to time stretch and maintain pitch is crucial to learning difficult passages and this app has it nailed. I love that it remembers my previous tracks so I can go back to them when I want to. I cant recommend it enough!
ohnothimagain about mimiCopy - Slow Down Player