Loosely used when the magnitude of a signal is meant, usually voltage. Strictly speaking, the term should be reserved for the value of a power in dB. The measured level of an audio signal is the amplitude that is caused by the sum of the powers of all of the components of the sound.

level control : An envelope parameter which controls the level of certain synthesizer actions, such as the sustain portion of an ADSR envelope. Compare with rate control.

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