Four vactrol VCA or LPG channels in a passive module that needs no power connection. Select the channel action (LPG or VCA) using jumpers on the back. All CV inputs are normalled together, and audio outs are also normalled to the input of the channel below. My go to VCA for quick patching. Comes with screws,  and I no longer need so many patch leads now I'm selling most of my eurorack, so each sale will include a lucky dip of a few patch leads as a bonus :)