A MIDI Controller message that controls the ability of a synthesizer to be played by means of its own keyboard.The local control message has one parameter, which may be an "on" or "off" value. When a synth with a keyboard receives a local control off message, the sound-producing part of the synth, and the keyboard and ancillary performance controls (pitch wheel etc.) behave as two separate units. Pressing a key will not produce a sound but will send messages out of the MIDI out port, while the sound-producing part of the synth will produce sound only in response to messages coming in through the MIDI in port. Receiving a local control on message restores normal operation. The local control capability facilitates use of the synth’s keyboard as a master keyboard for controlling other synths