FAEbGBD:
You impressed me there!

I agree with you; the XPs are good synths for editing sounds. I know many disagree with me here, but I find the XP-60/80 manual good enough to get started with sound editing. And the display/interface is actually quite clear-cut when you have used it a little. The manual gives you what you need to get started, the rest is trying.
As I said before, the XP sound editing IS complex. That is the whole idea of a synth. Personally I find the XP quite easy to work with.
Stig