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It's all my playing, but the system chooses what it "likes" and then places it in the recording (in real-time), while rejecting other stuff. The point is just to be able to jam all day and have worthwhile recorded material waiting for you at the end, no work necessary. It's really fun to hear what it comes up with. I'll definitely have more of your stuff incorporated too.

Ohhh so u loops it and then just keep jammin kinda thing?

Exactly. The song grows from nothing as you play. It might just be 1 beat it catches at first, looping over and over with a steady rhythm, then a few beats in a loop, etc, until it becomes however long. When I use a backing track like yours, it starts at that length but can grow from there.