Glossary: OMS | Sweetwater.com

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OMS: Originally an abbreviation for Opcode MIDI System, but was later changed to Open MIDI System, and is now Open Music System. OMS, which was developed by Opcode, is very similar in function and purpose to FMS, or FreeMIDI, and actually predates it as the original standard and widely used method of providing an environment for MIDI on Macintosh computers. The idea is that once OMS learns the configuration of your MIDI system any and all programs that are compatible with it (and virtually all MIDI programs on the Mac are) can get access to and take advantage of that information. That information could include patch names, attributes, and locations of your instruments as well as synchronization sources. Like FreeMIDI it handles all the data throughput between the various hardware and software components of a MIDI system and can even coexist in a system with FreeMIDI.

Oberheim OB-X	Oblique Room Mode	Occlusion
Octave	Octo Bass	Odd-order Harmonic Distortion
OEM	OFC	Off-Axis
Off Line	Offset	Ogg Vorbis (.ogg)
Ohm	Ohm's Law	Okoume
OMF (OMFI)	Omnidirectional	Omni Mode
OMS	On-Axis	One-off
One-shot Sample	Op Amp	Opcode
Open	Open Air	Open Chord
Open C Tuning	Open Mic	Open Source
Open TL	Open Tuning	Open Voicing (or Spread Voicing)
Opera Buffa	Operating System	Operator
Optical Compressor	Optical Media	Opto-isolator
Orange Book	Oratorio	Orbiter
Orchestrion	Orchestrions	Organ
ORTF	Orville Gibson	OS
OSC	Oscillator	Oscillator Sync
Oscilloscope	Ossicles	Ostinato
OS X	OTP	Out of Phase
Ovangkol	Overdrive	Overdub
Over Easy	Overheads	Over(s)
Oversampling	Overshoot / Undershoot	Overtone
Overture	Overview	OXFW911