[Elecraft] RCForb remove audio issues (i.e.: Microphone remote)

[Larry Snyder, HK2LS]

I have a PC connected to a K3. I am running RCForb on this computer.
Remotely I am running RCForb Client. I can control the K3 (and KAT500 and
KPA500) via the RCForb Client. I also can hear the audio remotely just fine.
My issue is when I plug a Pro 7 into the remote PC into the pink Microphone
jack the Microphone audio from the Pro 7 isn't making back to the PC and
remote K3. When I talk into the Microphone I see the level change under
Recording Microphone on the "RCForb client". On the PC with the K3 the
speaker level isn't moving with my voice. As a side note, on the remote PC
(connected via TeamViewer 13)I can fire up all the digital modes and I can
make QSO's just fine (i.e.: the audio works just fine in both directions).
Any ideas? Cheers from Colombia, HK2LS