I was just messing around with my Mustang Micro after not having used it for a year. I remembered that it has an amazing amount of features given it's miniscule size (11 amp emulators with a dozen varied effects) but it's almost impossible to use effectively without the button mapping that's laid out in the manual. As you know, the gadget doesn't come with a printed manual but you can download a PDF version of it HERE. It's only 8 pages with two color charts that specify what each colored light represents in terms of amp and effect choices.