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Boss MD-500 Modulation, effects pedal, Multi Effect, 12 classic Modulation-effects, A/B simul-mode: use 2 patches simultaneously, mixed or split A/B output assignment, insert loop function allows free effects placement, big graphic LCD, 297 patch memories, selectable buffered-, or true-bypass, controls: Mode - Rate/Value - Depth - E.Level - Param 1 - Param 2, switches: Up - Down - Exit - Edit, footswitches: A - B - TAP/CTL, connections: input A&B 1/4" jack - output A&B 1/4" jack - CTL/Expression - USB - MIDI In - MIDI Out - 9 V DC PSU input (5.5 x 2.1 mm barrel connector - center negative), powered by 4 x AA batteries or a 9 V DC power supply (not included), suitable optional power supply: item no. #102842, True Bypass, dimensions: (W x D x H) 170 x 138 x 62 mm (6,69" x 5,43" x 2,44"), weight: 1000 g (2,2 lbs),