In this circuit Q1 is a simple amplifier that has its gain
controlled by a variable emitter resistance supplied by FET Q2. In the up
position of SI. C3 discharges through R5 and the gain of Q1 decreases because
Q2 is driven toward cut-off. In the down position, Q2 conducts more, depending
on the setting of R6. which causes a gain increase. By varying R5 or C3,
various fade rates can be obtained.
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