In a message dated 8/20/05 6:57:47 PM, harrybissell at prodigy.net writes: << You can't use the dual element vactrols, they share the same LED so they will not go opposite directions as you would wish. >> Yeah, I knew that. I thought they had special ones with two separate LED's that were wired like 3-terminal pots. I know, it doesn't make sense.