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ADSR: Abbreviation for Attack, Decay, Sustain, and Release. These are the four parameters found on a basic synthesizer envelope generator. An envelope generator is sometimes called a transient generator and is traditionally used to control the loudness envelope of sounds, though some modern designs allow for far greater flexibility. The Attack, Decay, and Release parameters are rate or time controls. Sustain is a level control. When a key is pressed, the envelope generator will begin to rise to its full level at the rate set by the attack parameter, upon reaching peak level it will begin to fall at the rate set by the decay parameter to the level set by the sustain control. The envelope will remain at the sustain level as long as the key is held down. Whenever a key is released, it will return to zero at the rate set by the release parameter.

A & R	A-B Stereo	A-Time
A-weighted	A/B	A440
AAC - Advanced Audio Coding (also MPEG-2 AAC)	AAF	Abalam
Abalone	ABS	Absolute Phase
Absorption	Absorption Coefficient	Alternating Current (AC)
AC-1	AC-2	AC-3
Academy Curve	A cappella	Accent
Access Time	Accidental	Accompaniment
Accumulator	Accutronics Reverb	Acetate
Acoustic Lens	Acoustic Suspension	Acoustic Treatment
ACPI	Action	Actionflo
Active	Active Sensing	Actuator
Adagio	ADAT	ADAT/FST
ADAT Optical	ADB	A/D Converter (ADC)
Additive Synthesis	Adjusto-Matic	ADPCM
ADR	ADSR	Aeolian Harp
Aerophone	AES	AES/EBU
AES3	AES3id	AES42-2001
AFL	AFM	Aftertouch
AFTRA	AGC	Aggregate Device
Aging Toner	Agitato	Agoya
AGP	AHDSFR	AIFF (Audio Interchange File Format)
AIR	AIT	Alder
Alder	Aleatoric Music (Composition)	Algorithm
Alias	Aliasing	Alkaline Battery
All-Button Mode	All-Notes-Off	Allegro
Alnico	Alteration	Altered Chord
Alternate Tuning	Alto	AM
Ambience	Ambisonics	Amen Break
Amperage	Ampere	Amp Head
Amplifier	Amplifier, Instrument	Amplitude
Amplitude Modulation	AMS	Analog
Analog Sequencer	Analog Synthesizer	Anamorphic
Andante	Anechoic	Anode
Anodize	Anodized	ANSI
ANSI A-Weighting	Antecedent and Consequence	Antenna
Antenna gain	Anti-Imaging Filter	Anti-Aliasing Filter
Anti-node	Aperiodic	API
Apoyando	Apple Talk	Application (Program)
Architecture	Archival Stability	Archtop Guitar
Arco	ARP Avatar	Arpeggiator
Arpeggio	ARP String Ensemble	Arrangement
Articulation	Artificial (or Automated) Double Tracking or ADT)	ASCAP
ASCII	Ash	Ashtray Bridge Cover
ASIC (Application Specific Integrated Circuit)	ASIO	Aspect Ratio
Asperity	ASPI	Asynchronous
ATA	ATA-2	ATA 66/100/120
ATAPI	Absolute Time Code	Atonal Music
ATRAC	ATRAC	Attack
Attenuation	Audio	Audiobook
Audiology	Audio RIP	Audio Suite
AudioUnits	Audiowire	Auditory Cortex
Augmented Interval	Auranomic	Author
Authorize	Auto Accompaniment	Autolocate/Autolocator
Automata	Automatic Mixer	Automation
Auto Punch	Aux Send	AVI
AWG (American Wire Gauge)	AWM	Axe