Adam
I review my post, done on the road as I wanted you to not void your warranty. I was unclear. I should have said " I use Apex to control my WP-40s. BTW, I am VERY happy with the added control. My cable is a Torx type. Another controller company makes a cable for their controller. This angelic company's cable mode will work with an Apex but you must cut their connector and replace with one you made. You could use a Tunze Apex connector to splice to the above cable. Torx's postings here have the pin-outs illustrated. Or you can buy one on *bay. Just do a search for the Torx model cable. You can PM Torx. He is a very helpful fellow and will help you get a cable or make it yourself,
Goodluck
RJ