One of the features I really liked about the nandwich dual nand method was the optional status LED on the RF module, which powered the debug (red) LED when the RGH NAND was selected. I have the Demon's switch on the back of my console, so I can't always tell which NAND is selected, since I can't see the LED. So, I decided to add this feature to the Demon.
Here's a guide.
Here's the outcome when the RGH NAND is selected...
And here's the Youtube video that shows it in action.
[ame="http://www.youtube.com/watch?v=EGZS99D5EBo"]Demon Dual Nand Front LED Status - YouTube[/ame]
This can also be done with the second style RF module. Solder the collector lead to the right pad of R20. Sorry for the lack of picture.
Credit to JustM3 & hitman43 / CodeXecution from ModControl for the original nandwich dual nand method guide.
Just wanted to add that lead 1 of the NPN is going to ground. You can ground it anywhere you'd like. I took the pictures before I soldered the green wire from the RF board to the NPN collector lead. They should be connected. If you can't tell from the picture or the notation, there's a 100ohm SMD resistor from the base of the NPN Transistor to CR_EN. You don't have to use an SMD resistor.