Anytune Pro+ is the best “slow-it-down” app I’ve come across, and I’ve tried a LOT of them. You can get the free version to toy around with it, but I’d recommend the Pro+. In fact, I’m about to pull the trigger on the full desktop version (30 day free trial!). That way I can use the bigger screen to chop up and loop the tune, and send it to my phone for portability.
The only down side to this one is that it’s so feature-rich that it takes a while to learn how to use it to its full potential. Hence, the tutorials below.
One of my favorite features is the stepped loop feature. You get 10 repetitions that go from however slow you want, up to performance speed. SO handy!
And in researching tutorials I just learned a new trick: reframing. Holy smokes, I love this app even more. What a great tool!
Here’s a screen shot of one of the tunes I’ve been working on: Django Reinhardt’s version of I’ll See You In My Dreams. You can see the whole tune and all the sections I’ve repeated while learning the tune.
I set the loops so that when they repeat, the beat stays exactly the same, so you don’t have to adjust. The control is fine enough that with a few tries you can get it to repeat in time.