The WMD DVCA is a powerful little dual VCA eurorack module in 4hp. It is great for all sizes of modular synthesizer rigs big and small. The Zero Crossing Detector (ZCD) allows you to use snappy envelopes on smooth waveforms and eliminate clicks and pops.
There has been some mystery around the UPD A jack of the module which essentially lets you sample voltages to set the amplitude level of the VCA. In this video, Alex runs through two potential uses for this input and why you might decide to use it in a future patch.