Thanks for posting this. I was going to ask about it but the search engine took me here.
I have such fond memories of this piece, and how I just about broke my fingers trying to manage the positions.
My 10 year old self viewed this like the Bach Chaconne and it felt like the tour de force of classical music.
Coffee Roasting is like classical guitar, part technique, part art.
Without both the end result works, but never reaches what it could be.