Korg A3 vintage rack-mount Multi-Effects Processor

Famous for its use by U2's The Edge, particularly on Achtung Baby. Allows chaining up to six of its 41 onboard effects simultaneously and loading new effects from ROM cards. I know I have a ROM card for this kicking around somewhere but can't find it... if you want it, I'll provide it if I do. Usually these go for a minimum of $180, up to $400 with an expansion card. This one has a missing knob and superficial drip rust from being in storage on the underside (see photo), so the price is reduced. It's suggested to bring a guitar or other input to test it. It has a phones out if you don't want to haul an amp.