Its a very buggy application currently.

Shake Left/Right and it'll change the track (Next track)
Shake Up/Down and It'll Pause/Play

The problem is quite often it won't work for 5-10 minutes then suddenly start......On top of that occasionally it just WON'T work unless I do a phone reset. And yes, It does have a problem with sensitivity at times too, Sometimes I just have to touch it and it'll change, other times I have to jerk it hard to get any response.