MIDI Machine Control is a general purpose protocol which initially allows MIDI systems to communicate with and to control some of the more traditional audio recording and production systems. Applications may range from a simple interface through which a single tape recorder can be instructed to PLAY, STOP, FAST FORWARD or REWIND, to complex communications with large. time code based and synchronized systems of audio and video recorders. digital recording systems and sequencers. Considerable expansion of the MIDI Machine Control protocol is realizable in the future, and many diverse audio, visual and mixed media devices may thus be brought together under a single general purpose control umbrella.