I just build my redox keyboard and I found a problem about the right hand side is not working when connecting via the TRRS cable
this post was submitted on 23 Jul 2023
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I think this is the answer, there might be more issues with the state of the soldering but the build guide says it needs them (indicating they're using i2c for split comms).
OP needs to add 2x 4.7kOhm resistors on one half of the keyboard.
This. I built the redox and you do need those resistors, but only on one side if I do not remember wrong