La Sesenta y Siete 130 Envelope Detector is derived from the original 100 series 130 Dual Envelope Detector. Which produces a control voltage proportional to the instantaneous amplitude of an applied signal.<br /><br />It contains an audio signal input, a pair of control voltage outputs, and dials for the sensitivity and decay time. The Sensitivity control determines the proportion of the input signal which the envelope detector will respond to. When it is set at zero, all the way to the left, it will not respond regardless of the amplitude of the input signal. As it turned more toward the right, the envelope detector will respond to an increasingly software input signal until, when it all the way to the right, it will respond to any level input signal. *it is important to remember, its output is proportional too the input signal, so that a very soft signal will produce a very small value. Thus, the sensitivity control acts as a threshold device. <br /><br />The decay time dial provides an additional level of control over the rate at which the control voltage output fades out, When it is all the way to the left, the control voltage is released in exact correspondence with the amplitude of the input signal. When it is moved more toward the right, the release is not instantaneous, but is allowed to fade out over a longer time. The decay time can be varied from 0.01 to 1 second.