Intellijel Designs Mixup, Extendable Eurorack Format Audio Mixer, Inputs 1 and 2 are single-channel mono inputs, each with its own mute switch and level control, Input 3 is a two-channel stereo input with a common mute and level control, Input 4 is an additional, non-modifiable stereo input, Several modules can be connected with bus cables on the back, Width: 6 HP, Depth: 29 mm, Power requirement: +15 mA (+12 V) / -16 mA (-12 V)