The Zlob Push VCA has two independent unity-gain VCAs, with LED push-button switches. The SUM output is a mix of both channels. Both channel outs and the mix out are all operable at once. This module is great for cv or audio signals.
The module is normaled to +5v, so with nothing plugged into the inputs, voltage can be toggled on and off at the individual and sum outputs.
Available as either latching or momentary.
A manufacturer demo video showing some applications: