Step 3Create USB Connection Box
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A standard project box (can be purchased at Radio Shack) was used to hold the keyboard's circuit board and 1/4" jacks. The Easy Buttons will be plugged into this box using a guitar or other 1/4" mono cable. I drilled holes in the project box for each jack and fastened the jacks in place. After soldering is completed, the circuit board will be put in the box as well and a hole is drilled on the side of the box for its USB cable.
Wires need to be soldered onto the 1/4" jacks. The other end of these wires will be soldered to the locations on the circuit board that we mapped in the previous step.