Anyone using a Musicomlab switcher to change amp channels?

[AntKnee]

I've had my MusicomLab EFX MKIII for a while and it works great. I tried to use it to change channels on my amp, but it seems to have the polarity reversed on the function jacks that can be used to switch channels. When the switcher is not engaged, my lead channel is on and I want it the other way, so it switches to lead channel when I activate a pedal loop. Anyone know how to fix this?
If not, can I wire up an adapter to reverse the tip/sleeve configuration?