This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V control signal, it is intended for analog synthesizer systems. The circuit is mainly here for historical reasons, a higher quality panner may be built with the National Semiconductor LM13700 dual transconductance amplifier set up as a pair of voltage controlled amplifiers.
The control voltage is fed into the first half of a 1458 op-amp,
this stage inverts the signal and sets the offset and gain for the
right channel gain control circuit. This signal is then fed into
the second half of the 1458 op-amp which inverts the v