When configuring my RHH-135, I had to search various forum posts for information, which takes a while to get to the
important stuff. Most of the forum posts are about problems, and not solutions. So, I'm trying to help here by posting a
successful config for a RHH-135.
And, yes, you definitely need to reverse TIP and RING when connecting it to your Megadrum module. But, once
you have done that, configuration is straight forward. I've just done that directly in the module by resoldering two wires.
Below is part of the support manual that explains how the RHH-135 works, and also my Megadrum Manager config settings, which work well
for Addictive Drums.
Andrej