This is quad VCA which is designed only for audio use (unlike the standard Tangible Waves 2VCA which can be applied to both audio and CV signals).
As would be expected, each VCA has an audio input, an audio output and a CV input to control the level of the audio output. In addition to this, there is also an inverted CV output to allow cross fading or ducking of signals. A simple use of this would be to pan signals, using an LFO or envelope to control the level of VCAs panned left and right.
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