Adding an LED to this circuit...

[Kinkless Tetrode 66]

I am looking to add a red 3v LED to this circuit:
http://www.instructables.com/id/Make-an-easy-guitar-distortion-pedal-STEP-BY-STEP/step22/Adding-volume-and-distortion-level-controls/
How could this best be done?  Any recommended changes?  Thanks.

[CodeMonk]

Go back to step 20.
Use a 3PDT switch instead and hook up the LED there.

Look on this page : http://beavisaudio.com/techpages/