Okay, I'm getting the idea. More powerful song selection can be made by setting up auto-playlists with certain rules, and a playlist mixer that selects from these with its own rules. I'd actually seen the HOWTO thread, but I wasn't making any sense of it, but OrB's little note was the boost I needed to make it all click. So the answer was right in front of me in the program the whole time. I just never use playlists of any kind, and when I think of them I think of them as tools to listen to a subsection of my music, and so didn't think to look there for a way to select from my library as a whole. Now that I see my task though, it actually sounds like fun figuring out the best way to make it work for me. I haven't even started using it, and I'm wondering how I ever got by with the shuffle of a mere mortal. So thanks to everyone.