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===== ADSR =====
Acronym for Attack, Decay, Sustain, and Release. Commonly grouped together in an envelope filter.
===== Attack =====
The initial portion of a note's sound, where the volume goes from its minimum to its maximum. On guitar, this is almost instantaneous when picking the strings; however, it can be stretched longer through the use of volume pedals or knobs, feedback inducers, or other effects.
===== Augmented =====
In reference to intervals, the augmented 4th or augmented 5th is one half-step higher or larger than the perfect 4th/5th. For example, C-F is a perfect 4th, but C-F# is an augmented 4th. A chord is considered augmented if it contains a major 3rd and augmented 5th above its root. See [[1st and 2nd Strings - Intervals]] and [[Harmonic Minor and Augmented Chords]].
===== Chord =====
A set of 3 or more notes, played simultaneously or in sequence. See [[C Major Chord]].
===== Decay =====
Refers in general to a steady reduction of volume until a note is inaudible. In terms of ADSR, refers to the length of time it takes for the signal to reach its sustaining volume from its maximum volume.
===== Diatonic =====
===== Quarter Note =====
A note whose duration is 1/4 of a whole note. The actual duration in terms of beats is determined by the time signature, and its duration in terms of seconds is determined by the tempo. This is the most common note duration, with 4 quarter notes per measure in 4/4 time.
===== Release =====
In terms of harmony and harmonic progression, refers to the feeling of finality and completeness that occurs from moving from a dominant or tense harmony to the tonic (tension and release). In terms of ADSR, refers to the length of time it takes for the signal to become inaudible after the note is released.
===== Rhythm =====
===== Subdominant =====
The formal name for the 4th chord in a diatonic scale. Usually serves a predominant function. See [[F Major Chord]].
===== Sustain =====
In general, refers to the length of time a note endures before becoming inaudible. In terms of instruments, it can refer to the instrument's ability to sustain a note. For example, "This guitar has great sustain." In terms of ADSR, refers to the volume level of a sustained note.
===== Tempo =====