I really want to like this app, because its potentially an exciting app for its AB-loop capability for studying a foreign language and playing a piece of music; however, I think this app is broken, so I cannot even use it: If you put your phone to sleep, for instance, it does not play the loop. Worse, if you then turn on your phone, the chances are that the app will forget the carefully defined loop or even its playback position. Considering the fact that it takes some time and effort to define a loop, this is a major problem. So if you are looking for an app that does AB-loop well, you should probably get MusiCue, which has 5 memory locations for AB-loops and it retains all the memories no matter what, even if you turn off the phone. (This app has only 1 highly volatil unstable memory location.)
SY3360 about Music Player All-in-1 - Convenient Multi-function Music Player