Jammer pro is not an arranger software in that you can play it live like an arrnger keyboard. You can play from Jammer styles and step enter chords. The appeal for me is the flexibility in editing styles using a completely different approach than most other software or arranger boards, although Jazz sequencer also uses a similar approach but with a lot less options. ( but hey it's freeware). The approach is different because the notes are produced via algorithims that can vary ranging from the user exercising total control so that a specific note plays at a specific interval to completely random notes being produced based on parameters the user sets. Jammer live is true arranger software in that it functions in the way an arranger does, but Jammer Live users cannot make their own styles.

I'm not saying that Jammer pro is the the software to end all software, ( it isn't ), but it is certainly another useful tool in the arsenal for a player like me who might struggle with difficult drum patterns. There are trial versions available that will give you a good feel for what it can do. If you are interested in more info and a trial version, the link to Jammer is http://www.soundtrek.com

Cheers,
AJ