Thanks for the answer. I've already built about 200 pedals from the site, but I was a bit confused with it for using AC. I was not sure if I should use the ground as a reference with the DMM. But I managed to regulate the voltages without problems in the end. The board is ready and apparently everything is working perfectly. I have not had time to test with caution yet.
Nice! Yeah, AC was my primary concern too, as it was an unknown territory for me. Anyway, the lamp you have is prob for AC operation, but the "indicator lamp" cable on the board is after the bridge rectifier and should measure -12v DC. So, use a normal led, but take that cable to the cathode and ground to anode.
Be careful when setting the voltages for the rails. If you're using an SN74HC14N H-S trigger, then avoid running over +/- 11.0v. The chip will not support any voltage level above 11v either way. It's actually rated to only 7v, but it'll handle up to 11v. It was used in some original units. You can use the MM74C14N, or the more common CD40106BE at levels around +/-12v.
Also, in all the original units (and clones) I've worked on, none were ever adjusted to perfectly opposite voltages. There were always deviations of about 0.5v between the two, i.e. -11.0 / +10.5, or -10.75 / +11.25, etc. With clones, I found that setting the voltages perfectly opposite never sounded as good as having a bit of offset. A bit of imbalance, one way or the other, always yielded better tonal results. Feel free to tweak the voltages while playing through it. There's no hard and fast rules here.
I'm building the drone right now. Actually, voltage regulation is not fundamental.
I have not yet learned how to use the controls, but I have already been able to find sirens, bizarre pitch variations and many other things haha