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The L2 and R2 are where it gets to be a little more work. First you'll need to install a Pull-Up Resistor from 3.2v to the L2 and R2 lines, one for each side. The value is ~7.5k, but 10k will work just as well in this case. Then you'll connect your new L2 and R2 buttons wires to the L2/2L spots for L2, and R2/2R spots for R2.