KP32 Front-panel Headset Microphone Input: Balanced vs Unbalanced

Has anyone run into inconsistent performance of the front-panel headset microphone input when using un-balanced headsets?  These would include popular headsets such as the Beyer DT-108 or 109, the ASG LWS-4 or 5.  The Telex PH-88 has a balanced wiring configuration which should not be a problem, but the unbalanced headsets, only sometimes, will create a buzz when the talk is activated. I have had to tie pin-3 to pin-1 to essentially “ground” the (-) mic-preamp input.

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