the 5654 dual vca is an audio processor with 2 independent audio signal processors.

the left channel is a vactrol controlled amplifryer with a smoother sound. this circuit is from the 5u module named vactrol controlled amplifryer. what it does is in the name.

the right channel has more gain and clipping distortion and utilizes the tube for cv of the amplification. this channel responds well to audio rate modulation.

specifications:
18hp wide.
38mm rear depth.
500 ma +12 on first power up.
200 ma +12 after power up.
50 ma -12.