ADA MB1 programmable MIDI pre amp. Two channels, one tube one SS, compressor, chorus, five band semi-parametric eq, full MIDI, DI, crossover, two effects loops. A very versatile pre amp. It is completely analog, the interface is digital so that you can store your settings to one of 256 available locations, 128 of which are accessible by external MIDI controller. Full info here: http://adadepotforum.xs4all.nl/adagear/gearpages/preamps/ADA-MB-1.htm This unit is in excellent shape, it has always been racked. The tube pre amp has a matched pair of Groove Tubes. You can use the channels independently or combine them. The SS pre is very warm sounding and there are three stages of drive for the tube pre, clean, edge and full. Using the edge setting and varying the input level allows for some sweet tube grind. $250 shipped to the CONUSA. Will ship internationally, price will have to be adjusted depending on location. Please PM me with any questions.