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A change in pitch that occurs when moving up or down two piano keys

Absorption
Short for the term Acoustical Absorption (quality of a surface or substance to take in, not reflect, a sound wave).

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The condition of obtaining a change at the output of the device which is proportional to the change occurring at the input.

Chorusing
1) A term meaning the same thing as Chorus (Definition 3 or 4).
2) In some delay effects devices, a term used to mean the term Depth (the amount of change in the controlled signal by the control signal).

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The letters A, D, S &R are the first letters of: Attack, Decay, Sustain and Release. These are the various elements of volume changes in the sounding of a keyboard instrument.

Hard Disk Recording
The recording of digital audio onto a hard disc.

Amplitude
The height of a waveform above or below the zero line.

Distortion
Usually undesirable result of overloading sound equipment. Reducing the levels can remedy the situation.