Glossary: Open | Sweetwater.com

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Open: The term used in electronics to signify no connection between things. Obviously you'd assume that most things aren't connected because everything can't be connected to everything so open is really used to signify there is no connection between two things where there is likely to be a connection. For example, a standard light switch may be in a state of closed (where the switch is "on") or open (where it is "off"). In audio patch bays open is a type of normalling distinction that means there is no normal, or no connection between the two points in question.

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	Oxide