Look, lets be honest here. This is a totally simplistic app, its not meant to do anything super sophisticated, but that said, its a lot of fun and great practice tool. I love just scrolling through the different grooves and letting em inspire a groove. Or finding a beat that fits a groove Im working on. And it all helps with my timing and my tempo. Especially the practice section where the beats drop out for a bit and come back in. That really helps keep my playing honest and my focus sharp. All of the drum tracks sound great either in my headphones or jacked into the aux jack on my guitar amp, or jacked into my home stereo. Even through my iPhones speakers it sounds good. They really EQd the sounds really well to sound great in a variety of situations. A lot of fun. Totally easy and simple to use....