As a hobby DJ I bought a Hercules DJ console some time ago. When I saw habel the app, I was surprised that there is such a thing for smartphones. In the first test, however, there are clear weaknesses. Since the smartphone has only a headphone output is previewing songs only a mono channel. In addition, you can not have the wide range of songs available on the PC as on the small memory of the smartphone. All in all it is a good app to play without a break between songs and adding effects.