So basically this ReGroove thing is an assortment of different templates, based on midi patterns (I'm assuming their midi data), for use with percussion? If so that's pretty cool and convenient I think. I use FL Studio and wouldn't mind to mess with a lil tool like that. Perhaps GURU does something like that. FL Studio comes with some groove templates under it's quantize feature, but it really ain't no big deal. This is where the MPC comes in handy though because you can just bang your shit out rhythmically.