If you've got a set that you had your eye on doing, contact the original artist. Lots of them are incredibly nice, especially about giving permission or not. If they do give permission: abide by their restrictions, give credit, and away you go. If they don't: that's life. Make it for yourself and move on to the next thing. Anyway, it never hurts to ask. Schlabber is in the chat room lots and he's a really nice guy. Prolly WON'T want you posting tweaks as he's now selling his CD (and put LOTS of work into it), but who knows....