The effect needs a 15V supply so you can either use a standalone 15V adapter if you have one, or build the included power daughterboard which with double the supply and then uses a regulator to reduce it to a stable 15V.
The schematic was based on a mono version of the old MN3007 Clone Theory, but this is the manufacturers information about the current XO version:
This recreation of the original 1970's Clone Theory is re-known for its very edgy chorus. Stereo outputs provide lush chorus and vibrato with a sparkling wash and liquid elegance.
CLONE THEORY, one of the most lush, deep and warm CHORUS/VIBRATO ever made, now in stereo. The CLONE THEORY’s depth and rate controls swing from one extreme to the other, giving the user an entire realm of possibility for tone.
[20th May: re-jigged slightly reduced the number of links, no corrections were made so the first layout posted should still be good]
and here's the stereo daughterboard for those wanting the option