These are great little amps, but sometimes you want it louder. Ok, ALWAYS want it louder, because nothing (guitar related) is better when it's quiet.
Ok, here is how you add an extension speaker jack to a Micro Crush. Dead easy, but thought I'd share incase someone else wanted to do it.
*I've gleaned so much info from various forums, this is like my way of giving back a little bit. Hope it helps someone.