Yes, the original kit was built to accept dynamic mic's only, and I am trying to use a cheap generic computer condenser mic. I have no idea why the original schematic was designed with a 560 ohm resistor, though
I actually had forgotten to mark that resistor change on the schematic (I'll reupload). I currently have it at 1k, but will try 10k per your advice.
Shorting to +8.3v was designed to emulate the advice found on
this page, in order to power the electret microphone.