The mic trim pot on the console sends a control voltage to the pre.

It is generally used as a control voltage for another module.

Conditions which may affect the network, such as temperature, control voltage, and bias current, where applicable.

Sophisticated designs may also adjust the control voltage over time to compensate for crystal aging.

The functional relationship between the control voltage and the output frequency may not be linear.

This means audio signals can be used to modify control voltages and vice versa.

Almost every parameter can be controlled from an external control voltage.

The capacitor is charged up until it holds the correct control voltage, slowly leaking this through the crystal to the common ground.

The control voltage is passed into an amplifier which provides the power to alter the valve's position.