GrooveStep Digital Music Studio is a revolutionary ultra portable music making application for the Nintendo DS. GrooveStep features an easy to use step sequencer for pattern based music making. You can make beats, melodies and full songs with GrooveStep.

This are just work in progress news, there is no release yet – but here is a Youtube Video -> https://www.youtube.com/watch?v=LaBy4cvbRAk

http://www.groovestep.com/