Worked fine after I figured it out, but you didn't provide enough info for this; here are the three biggest things I'd have liked to know. The preinstalled jumper to the left of the outputs will cause it to run a 'test mode' where it runs front left, front right, rear left, rear right, then pause; in order to actually use the thing, this jumper must be removed. The input wires are labeled thus: Yellow is forward/reverse, Blue is strafe, and no label is rotate. Hot swapping wires does not usually seem to achieve the desired results; you often must power cycle the mixer.
(AndyMark feedback: Thank you for this input. We will add more documentation.)