I've included a couple switching options, they both allow the modulation to drive either Delay 1 or Delay 2 or bypassed. The 2nd one also replaces the on-board rate LED with a bi-color LED.
I also could not find the schematic. My plan is to use modulation on a delay with 3 pt2399 chips and be able to select which chip the modulation is on. I wasn't sure of where the output is for the DeProfundis mod board, where as for the 1776 board it looks like depth 1&2 would be the output. For the DeProfundis, do you know if the output is where the board connects to time 1? Or would it be the switch that selects between ground and time 2&3? Why does the DeProfundis mod board connect to both time lugs? Or would this be the setting that gives you the "funky mode"?