(1) A system is said to be linear if it meets the conditions of proportionality and additivity: if its output level changes smoothly in proportion to input level changes, and if input x causes output X and input y causes output Y, then x + y at the input must cause X + Y at the output. Most tests in audio including frequency response, gain, phase, impulse response, etc. assume linearity.
(3) A process which works in a sequential fashion, such as magnetic tape recording, playback the or editing tape media, etc., as opposed to a sequence of steps which can be taken in any order and/or in any location, such as the random-access editing and playback processes which are made possible by digital storage technology.
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