The One Control Pedal Board Junction Box 4M belongs to the Minimal Series, which offers many useful tools and gadgets for modern pedalboards. The JB4M comes with two pairs of 6.35 mm (1/4") mono jacks, two pairs of 6.35 mm stereo jacks (TRS) and a pair of MIDI jacks which are all respectively connected to each other. The Junction Box 4M is perfect for a pedalboard that requires mono inputs / outputs, a switch control for amplifiers via 6.35 mm mono / stereo jacks or a MIDI control for amplifiers or other devices.