Glossary: VCO | Sweetwater.com

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VCO: Abbreviation for Voltage Controlled Oscillator. It is an oscillator whose pitch (or frequency) is controlled by an input voltage. In a keyboard, for example, pressing different keys produce different voltages, which then drive the oscillator circuit to produce specific pitches (notes). Modern (digital) keyboards don't work this way anymore, but back in the days of analog synthesizers it was all done with voltage. A lot of the old stuff was one volt per octave. So if it took one volt to go from a low C to the C an octave higher, it took an additional volt to reach the next C up, and so on.

Vacuum Tube	Vako Orchestron	Valve
Vaporware	Variable Pattern Mic	Variable State Filter
Variac	Varispeed	Varitone
VAST	VBR	Voltage-controlled Amplifier (VCA)
VCA Group	VCF	VCO
VCR	VCXO	Velocity
Velocity Compression	Velocity Curve	Velocity Split
Veneer	Verse	VESA
VESA	VFO	VGA
Very High Frequency	Vibrato	Vibratone
Vibrato Tailpiece	Vibrola	Video Sync
Violin Bass	Virtual Analog Synthesizer	Virtual Dolby Digital
Virtual Dolby Surround	Virtual Instrument	VirtualMemory
Virtual Slave Reel	Virtual Track	VISE
VITC	Vivace	Virtual Network Computing
VOC	Vocal Booth	Vocoder
Voice	Voice-Stealing	Voice Coil
Voice Leading	Voice Over	Voicing
Volatile Memory	Volt	Volt-Ampere
Voltage	Voltage Clamping	Voltage-controlled Filter (VCF)
Voltage Depression	Voltage Regulator	Voltage Sag
Voltage Spike	Volume	Volute
Virtual Studio Technology	VST2	VST Instrument