This post was published more than a few years ago (on 2008-11-19) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
Just as a reminder to myself:
XLR Pin 1 = TRS Shield (I use ground wire)
XLR Pin 2 = TRS Tip (red)
XLR Pin 3 = TRS Ring (black)