Glossary: Op Amp | Sweetwater.com

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Op Amp: Short for Operational Amp, a circuit component used in all sorts of equipment. Though they are technically considered amplifiers they are quite often used in circuits that do not obviously "amplify" signals. Examples would be equalizers, crossovers, compressors, mixers, microphones, keyboards, effects and many, many, many more (the list is endless). Op amps acquired their name from early uses in analog computers (computers perform operations, get it?). They can exhibit very high gain and are extremely easy to build into audio circuits. Nowadays they are available in integrated circuit chips, each of which may have many op amps inside. In some cases they are literally a dime a dozen.

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