I play drums in a progressive technical metal band, and have been looking for an easy way to make click tracks to our songs. This ap has saved me a lot of time and frustration. I can put as many tempo changes and time signatures as i want into this program, with no trouble at all, and play a long with the tracks at band practice, and on stage. This is the ap I wanted to make a long time ago, and Im extremely greatful someone finally did. Its worth the price...if it were a computer program, instead of an ap, it would cost much, much more, and its much easier having my iPod to work with on stage, than my laptop. Thanks!