I've been noticing this kind of popping sound when I'm using my pedal board for a while now. It's relatively subtle but lately its been driving me mad. I was really busy gigging over the summer when I started my pedal board obsession and threw my pedal board together. I'm trying to think if it was making this noise when I first took it out of the box before it went on the board... Anyway, I've finally had some time to sit down and A/B it. Take it out of the chain and isolate it. It's definitely coming from the Super Symmetry Compressor. Whether it's off or on. Which is funny because I have been using the comp to try and mitigate the noise for months now. It's like a popping noise that occurs when I pluck the string hard. If I don't push it to pop it will tend to distort a little bit on the attack. I'm probably going to end up contacting Dark Glass but I thought I'd bring my issue here first. See if anyone had some input on it. I'm powering it with Godlyke Power-All but I haven't had any problems with other pedals.