[Elecraft] sidetone mod now works

[Darrell Bellerive]

I played a bit with this mod this evening. I can duplicate the results, but 
I'd like to understand a bit more about this circuit.

What is the purpose of RP5 pins 7/8 and pins 9/10? This grounds the audio 
signal via 940 ohms of resistance. Is this just to provide a DC bias for the 
electrolytic capacitors or does it have a role to play with the audio?

-- 
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada