A cheap, novelty piece of software.

+

1) The riff library lets you create bumpin' tracks in minutes. Instant gratification for the player.

2) Everything is very customizable. You can change the sound of each note to whatever you want, create your own riffs of any specified size, and so on.

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1) This software is just a cheap toy. If anybody was serious about creating music, then they would ditch this and do it the way professionals do.

2) Very steep learning curve. The tutorial and help system doesn't help much.