I have twice tried this demo after hearing what bluzeplayer had said about it. It sounded to me like exactly what I wanted, being very frustrated with not being able to get the drums I wanted for my tunes. The concept about playing along in free mode and having it jam along made my socks roll up and down.
Unfortunately though I was disappointed with both goes at it. Perhaps I expected more, didn't grasp it well enough, I'm not sure which or both.
For me I think using something like Acid, drums from styles, my Fantom or BIAB for my drums works better and is more straight forward.
I really would like to have something like this though. Could be I just didn't use it properly each time.
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jam on,
Terry
http://www.musicchops.com/forums/