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This input allows linear modulation of the VCA by an external source (the usual control input from an envelope generator).
This input allows logarithmic modulation of the VCA by an external source.
This is an external input that allows audio and control signals to be processed by the VCA.
This is the output of the VCA, as it is also the final output when used as a complete synthesizer a 1/4” socket is
duplicated on the rear panel for convenient patching to your mixer.