[Elecraft] [K3] weird VOX experience with headset mic

[Monty Shultes]

I just bought a Plantronics computer gaming headset, model 377, to use with my K3 after reading some of the posts about the Yamaha headset. (I had some bonus bucks to use at Best Buy.  They don't carry the Yamaha CM-500)  It works beautifully with one funny problem - if I try to use VOX, the radio goes into transmit mode even if I have the microphone muted.  I figure the receive audio must be inducing enough signal on the mic leads to trip the VOX.  No setting of ANTIVOX gets rid of this.  I have the audio from the K3 as low as possible.  Any experiences and suggestions welcome!

Monty K2DLJ