Very good game @putrapetir, this is a great application to make music. Here I will leave my comments of PROS and CONS.

Pros:

• It has a beautiful and modern graphic interface that brings together all the skills of a professional bass.
• You can create and make music from anywhere and no previous knowledge is required to use this application.
• You can place up to 4 songs in queue and edit their start sound, create sound loops etc.

Cons:

• Its price is too high, since there are applications of similar features with lower price or free.
• Only available on iOS devices, it would be great to see it on Android.
• Its weight is exaggeratedly something (1.1GB).