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Action: A term used to describe the way a musical instrument plays. Its use is highly varied in the industry, but in a general sense it refers to the playability of an instrument or how well it functions mechanically. It often specifically relates to how much force is required to play the instrument. "Piano action" or the more generic "weighted action" is used to describe some keyboards, for example, where it means that the keyboard itself feels sort of like a piano in its mechanical operation, as opposed to an unweighted synthesizer style action. You have to press harder on a piano to make sound, but this "feel" is very important to players. There is also the "hammer action," which pertains to a keyboard that actually uses a hammer mechanism internally to more closely simulate the feel of a real piano keyboard. Hammer, weighted, and piano action are terms that tend to be used interchangeably even though they aren't exactly the same thing. In guitars and basses the action again refers to how the instrument plays, and specifically to how much down force is required on the strings to properly press them against the frets. A lighter or lower (as in strings down closer to the frets) action is considered easier to play, but just like the piano some players don't like it to be too easy. What constitutes a "good" action is very subjective and each player typically has his own tastes.

A & R	A-B Stereo	A-Time
A-weighted	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
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	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