Abbreviation for MIDI Manufacturers Association. The MMA was formed in 1984 as a “trust” to maintain the MIDI specification as an open standard. The MMA provides forums for discussion of proposals aimed at improving and standardizing the capabilities and marketability of MIDI-related products, and provides a process for adoption and subsequent publication of any enhancements or clarifications resulting from these activities. The MMA members include large and small companies from just about every application of audio and MIDI technology, including stage and theater, performance, recording, multimedia computing, film and broadcast. Membership is open to anyone commercially involved in the design or manufacture of MIDI hardware or software. Their website is at www.MIDI.org.