Tested on XPR-6350
Based on reverse engineering of the native speaker mic:
pin2 (GND) → 3.5mm TRRS sleeve (GND)
pin4 (PTT) → 3.5mm TRRS ring2 (RIG_PTT)
pin3 (MIC) → 3.5mm TRRS ring1 (RIG_AFIN)
pin5 (SP+) → 3.5mm TRRS tip (RIG_AFOUT)
pin7 → pin12
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