Good bang for the buck

I used to use Amazing Slow Downer, and occasionally Capo, but sometimes I got some stuttering in ASD.
But now I have switched to Anytune because the interface is uncluttered, there are absolutley no glitches in playback, and it sounds good even when slowed down.
It has become my go to app for practicing over backing tracks.
Glad to give them 5 stars.

American Prof. in Japan about Anytune: Practice Perfected, v1.3.2