Here’s a way to install a release control to the Atoner envelope section. Simple, but effective. Play hard for full distortion, let a chord ring and slowly ‘flange’ back down into Atoning; or pick lightly for atonal clicking.
100 uF capacitor from attack 1 to ground. 100K pot + 2K resistor from attack 2 to ground.
Convert attack to release: To one lug, solder both attack wires plus a 100 uF cap to ground. Other lug, 2K resistor to ground.
1 x 100K potentiometer linear taper Mouser 313-1000-100K
1 x 100 uF capacitor Mouser
1 x 2K resistor Mouser 291-2K-RC