This guide will show you how to connect any foot pedal to your Guitar Hero Guitar using the RJ11 Phone Jack port and a RJ11 Phone Cable.
For those of you with a USB pedal that can be mapped to a keyboard key, this does not apply to you, but can still be done as long as you can find the solder points for the actual switch.
The concept here is to use the switch/button in the foot pedal to act as the select button on the guitar. USB Power or data is not needed here. Just a simple two wire (+ -) connection from the pedal switch/button to the select button (using RJ11 Phone Jack).
Step 1: Preparing the RJ11 Phone Jack in the Guitar
1. After opening the guitar, Remove the RJ11 port and flip it upside down to reveal the 4 solder points of the connector.
2. Solder together the two joints on the right side. I just used some excess solder, but you could run short wire if you prefer. *Soldering these together is necessary because we need the middle two wires to be active in order for the switch to properly activate SP. If you look at how the RJ11 port is attached to the board, one of the wires is not traveling on the second path leading to the wires solder point.
3. Now, remove the hot glue from the pins on the strum bar board. De-solder the wires from the strum bar board.
4. Solder these wires down to pin 1 and 3 of the Start/Select buttons. Polarity does not matter here.
Step 2: Soldering a RJ11 Cable to the Foot Pedal
This should be the same process, but depending on your foot pedal the switch and internal components will look different than mine. My pedal is an Olympus RS27 that I got from my work when we were throwing them out. Unfortunenlty, this model does not support keyboard mapping which led me to this mod.
1. Cut the RJ11 connector from one end of the cable to expose the wiring. Strip the wires and prepare for soldering.
a. I am using a simple 2 wire RJ11 Cable. If you have a 4 wire cable, only solder the middle two wires. (red and green)
2. Locate the switch inside your foot pedal and find the two leads. We will solder one wire to each one. It does not matter which one goes where as long as they are not attached to the same lead. (You should see the current wires that go to the switch. We will be adding our wires on top of these, or you can replace them with our new wires if you don't need to retain its original functionality.)
3. Route your cable to exit the foot pedal. Plug the RJ11 end into the guitar, and hit the foot pedal to activate SP.
4. Hot glue your solder connections on all pieces after testing has been completed.
I included some videos of examples of people repairing their Guitar Hero/Rock Band foot pedals. This should show you how the wires would be soldered to the switch/button.
If anyone wants to send me photos of their pedal, message me with a link and I can add them to give as many examples as possible.
Step 3: Another Idea
Using a RJ11 or RJ45 Keystone and cable/wires to solder to the foot pedal to make a female connection. You could then use the RJ11 cable without having to cut it. RJ11 cables will fit into an RJ45 and uses the two middle pins.