Mod1 is the modulator. Envelope and Mod2 should be thought of as VCA (AM) inputs, but separate. Envelope is a straight VCA control voltage (CV) input, while Mod2 is an attenuated/variable CV input. The morphing of the Mod1 function is not fully controllable by CV and must be varied using the knob to access the full range of variation. However, experimentation has shown that a control voltage applied to the second Mod1 input can be used to voltage-control a small range of the function morphing.
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