I bought an MPA-100k to build a box to convert MIDI CCs to control my wah, and at some point in the future, my Rotovibe, when I get it. However, after hooking everything up, all according to the instructions, and double checked by my dad, a seasoned electrician, when I plug my newly created box in to my moded wah, with a stereo cable my guitar signal sounds grounded out. I can say that on the bright side, The MPAs MIDI works fine, as I can hear it sweep when I waggle the pedal. I've tried unplugging the MIDI cable, and checking for loose connections, but no dice. I'm wondering if I need to run a wire from the jacks to a ground, or something, but I don't know, and my dad can't figure it out either. So HELP! Please.
Also, I'm posting from my phone, so forgive me for any weirdly phrased sentences, my dyslexia can get the better of me if I can't see the whole sentence.