>>If your rig still has the M1 and M2 audio cutoff connections to relay K3, then what you are hearing in your audio is not a transmitter issue, but an RF overload condition from the TX output back into your audio preamp. In another post of mine I described how to eliminate this issue by cutting the paths in the audio from K3.<<
Switching audio in K3 was inviting pain.? I'd advise cutting traces to m1/m2 and and bridging them
pls add the pop fix.