The Loopz app is used to play stock rhythms. It has a wide range of rhythms of which you can change the tempo and volume. The rhythms sequences are accurate and can be used amplified. You can select the category of rhythms and the number of beats per measure. You can also select favorite rhythms and lock the rhythm to a certain tempo. The interface is user friendly and the app has a good over-all design. It is available on Android.