I saw Les demo his black box at Veneman's Music (Rockville, MD) back in the late 70's, just after the first 'Chester & Lester' lp was released. it was completely amazing to witness, just him and a young drummer. he wasn't feeling well but still managed to perform with enthusiasm and entertain the crowd with funny stories and lots of jokes. afterwards he hung around to sign stuff and I brought my copy of 'Chester & Lester', which he was nice enough to sign and black in one of Chet's teeth. I'll try to scan the cover, it's a hoot.