Performance Mixer Output ModuleA-138o is the output module that can be combined with one or more A-138p.level controls for Left, Right and Auxoutput sockets for Left, Right and Aux (3.5 mm mono sockets)A-138o requires at least ine A-138p (no stand-alone use)http://www.doepfer.de/A138p.htm20 mA +12V2..