I've built tons of pedals, and thought it would finally be nice to have an audio probe so I don't have to fire up the signal gen and scope. I made one with the little board available here, and use it as the photo shows. It works fine, when the probe is touching a component, and in also in bypass. But- when the probe isn't touching anything, there is a loud buzz. Is this normal for an audio probe? do I not have something grounded? I did initially solder the jacks backward, and when I reversed them I broke the pad off of a connection. I just ran a wire to replace it. Same as if the trace was there.