With this circuit it is possible to use a control voltage to select audio signals that pass through the circuit. The source of the control signal can be a microcontroller which leads us to an interesting control shield. The number of inputs can be increased, and the operational amplifier can be a 741 or a more modern low voltage type. The source for this amplifier must be symmetrical. For the 741 it can be 6 + 6 V.
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