Brain storm , remove signalink from the equation , din pin 4 yellow AF out and din pin 7 violet wire GND to trs stereo cable spliced to give two cables L+R connected , plugged into ground isolator and plugged into USB mic.
din pin 3 green wire with same stereo to mono adaptation to headphone shocket on USB sound device.
Cat and PTT via USB to CIV com cable to com port on radio
Radii setup with LIN to ON , G-LIN 4 LOUT to ON G-OUT to58 ( adjust mic and volume on PC and the above settings as required)
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Steven McDougall 2M0ufo