nelson is right, 3pdt with milenium bypass.
fwiw, on my clone theory, i built the "stereo" option...it is always on on mine, and wet. i used a switching jack to short the stereo output to ground when not being used.
if i DO use it, that output is always chorused...since i just use it in mono, i generally don't worry about it...no need for 4pdt or mil bypass.
that said tho, the original clone theory is just a second jack that is always dry...it's not a "stereo chorus". i would have preferred to build it as original, as the stereo option, tho it sounds nice, just sounds like a pair of small clones more than a clone theory.
i don't think the "stereo" output was even buffered...i think it was hard wired in parallel with the input jack.