USB Midi Device from old Gamepad

Step 6 Solder wires to each of the two contacts (see next step)

This needs to be done for each button you want to use. Color coding makes things easier.

Or solder using a ground. (see next step)

Comments

[ShuckDarns]

how do you determine whats ground and whats hot?

[cheft]

If you look closely at the circuit board, you can see where multiple buttons already share a ground. Just use a small wire and connect different areas and see if it registers buttons. Alternatively, you can get a meter and Ohm out each contact point.