Your red wire is coming from the J-FET control voltage in that, if you look at the CE-1 schematic the second output is just a dry output directly from the 470nF capacitor (C32 in your schematic) with a divider after it to match it to the mixed level.
I don't understand why you've removed the wet signal FET control and left in the dry signal one?
Anyway, i'll take a board and DC converter set.
Edit: The 'stereo' output uses a switched jack too connected to the 'mono' output so that with just the mono connected a mix is provided, when something is connected to the stereo jack one provides delay only signal and the other dry.