And I don't know why I didn't build one earlier. This little thing is great. Luckily - I'm not getting any severe ground loop hum. I did this one as a passive box because of the size of the enclosure. I did the red LED for the "Both On" indicator. I color coded the individual LED's with the Jewel Lights on my amps. I used a purple LED to match the purple jewel light on my Super Reverb and an orange LED to match the pilot light on my JTM45. When both amps are "On" - it will still indicate which amp is "on" when taken of the "Y" function. Very handy. I'll add some decals for lettering and whatnot later. here's the pic of it - left pic is just the Super Reverb and the pic on the right shows the pedal in the "Y" mode with the JTM45 as being the amp it will go to if taken out of the "Y" function.