The MASTER module is the base of an AE modular system if MIDI control has to be possible; it contains the voltage regulation (5V) for the power supply of the modules a 3.5mm minijack MIDI input; the MIDI channel can be selected between 1, 14, 15,16 or OMNI In/out-sockets (3.5mm minijack) for audio out and/or interfacing with a Eurorack system all bus signals (CV, GATE, CTRL, MIDI clock/start/stop) as patch sockets IMDI output The power supply is a 9V DC CENTER POSITIVE wall adapter (see here). Note: The MASTER R6 is the latest revision of the MASTER module which is the core of most AE systems; what's new here is: The bus signals CV, gate, ctrl CV, MIDI start/stop/clock can be connected with / removed from the bus individually with the microswitches The TRS MIDI input now accepts both types of TRS-MIDI adapters The mechanical design is changed to be compatible with the QUICKSWAP CASE