"Any traction?   Can anyone point me to an appropriate circuit schematic 
or other resource? "

You don't mention what rig is being used.  Many modern rigs provide a USB port 
for use with a PC.  This USB port typically provides an audio as well as a CAT 
interface.   With such a rig, mixing PC sounds with rig audio requires setting 
the rig CODEC audio properties to "listen to this device" and adjusting the 
audio balance with the volume mixer.   The only hardware required is one USB 
A/B cable.

If you do this - Please don't allow the rig's audio CODEC to be the PC's 
default sound playback device!

Andy, k3wyc


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