Quad Decay Module

I sort of finished this module today. It's a Barton 4x Decay, or Quad Decay as I prefer to call it. It's basically just four simple envelope generators. I decided to add a switch and resistor to each circuit to allow a little live tweaking. Around 16K seems about right for me. There's only one problem, my stock of Switchcraft jacks isn't due for another ten days...