Open the two audio jacks by unscrewing the knurled jack housing. You'll see a plastic tube over the jack connections. Remove it and save it for later.

The nOOd's anode is soldered to the audio jack's tip. The tip is on the left of a stereo audio jack.

Insert a 220Ω resistor into the hole in the audio jack's tip. Solder it in place.

Identify the nOOd's anode connection. It has a tiny hole in it. Solder it to the resistor.

Apply heat shrink to the soldered connections, completely covering the resistor. Slide the audio jack's plastic tube over the jack's pins and close up the jack by screwing in the knurled housing.

Slide the knurled housing over the cathode end of the nOOd, followed by the jack's plastic tube and a piece of heat shrink.

Solder the nOOd's cathode to the audio jack's ground pin. The ground pin is the longer pin in the middle of the stereo jack.

Apply heat shrink to the soldered connection. Then, slide the audio jack's plastic tube over the jack's pins.

Close up the audio jack's knurled housing and you have an LED "cable"!