I'm interested in doing the expansion audio mod to my NES, so I can use my Everdrive to play Gimmick and hear the extra sound. I plan on using the mod in the link below. I have an NTSC NES, and I only use my Everdrive N8 (no Famicom cartridges, Powerpak, etc.). Can someone who has done this mod please recommend the proper resistor for my setup? I want whatever sounds closest to the correct sound, of course. Thanks.
http://www.retrofixes.com/2014/05/open-hidden-sound-channels-in-nes.html
The recommended resistor value is 47k ohm soldered between pins 3 and 9 of the expansion port.

Looking up the resistor color code from the photo above, we see a yellow (4), purple (7) and orange (3) band. This represents 47 followed by three zeros or 47,000 ohms, which is exactly the value originally recommended by Brian Parker of RetroUSB.
I went full custom and used a grounded 10k audio pot for adjustable volume on my NES, but mine is a bit more advanced mod, for system tweakers. For adjustable volume mod like mine, connect one end of the 10k volume pot to ground (pin 2 of the expansion connector) and the cartridge output (pin 9) on the other end. Center pin on the pot goes to the NES mixer input (pin 3). Rotate the pot counter clockwise to decrease the EXP volume (full CCW is effectively muted) and clockwise to increase the EXP volume. Keep the three leads bound tightly together to help minimize noise. I used a 3-pin CPU fan header for quick disconnect and mounted the volume pot with a big red knob above the controller ports on my nintendo. Mine is an audio taper pot and the expansion sound sounds "balanced" at about 2/3 of max volume.