Time and patience are your friend, grasshopper. Thirty five years on, i just got one track from a demo that just kills the released version. And that's from a good friend who played the entire demo on the way to go see that artist play back when we were in high school! They're stereo mixes, not multis, but they're gold to me. I never thought I would hear that version again. But he tossed me that one track and I am very grateful.