I just got one of these last weekend, it's been trial and error working everything out and I'm still not there.  Judging by some of the posts about the DR-3, this isn’t the easiest thing to program, and I've found it easier the more you play around with it.  I like it though, and have managed a few decent beats that sound good for someone who has never played drums or messed around with a drum machine before. Going to have a look at copying patterns this weekend, but have figured quite a bit out if you want to talk about it, I'll try and help.