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I've already used a multimeter to verify that the TRRS cable is connecting the correct pins across both boards on the TRRS connector, and even verified that they're connecting the correct pins on each pro micro controller (e.g. GND to GND, VCC to VCC, Data to Data) according to the PCB layout (https://github.com/tamanishi/Pinky4/tree/master/pcb)
NOTE:
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