I am new to modular but not new to synthesis concepts. I understand the basic concepts of subtractive synthesis, but the West Pest is a bit different than what I am used to as it uses a low pass gate instead of an Envelope + VCA.

I would like to have the Doepfer A-140 control the attack of the West Pest's amplitude. I have tried patching as shown and am not able to trigger the envelope. The patch points with yellow text on the left side of the West Pest patch bay are the audio/cv inputs and the white text ones are the outputs.

To my understanding, a low pass gate takes the place of a filter, envelope, and VCA of a traditional east coast style substractive synth.

The A-140's light stays on when powered on with nothing plugged into the patch points, and stays lit when I have it patched as shown. From videos I have seen the LED brightness is supposed to follow the ADSR stages when triggered properly. Is it normal operation for the LED to stay lit when not patched into anything?

What am I missing? Thanks in advance for any/all help- excited to slowly build my rack over time, but have to start with the basics.

https://cdn.modulargrid.net/img/patches/modulargrid_108127.jpg