I've never built a pedal before but I've been leaning toward taking finally taking on a project. I've got a couple of utility pedals in mind that I think would be useful. One of them is a simple blender pedal. Anyone have a confirmed schematic or know of a kit that will allow me to blend an effects signal with the clean signal? I would want it to have the ability to swap polarity in case there's a phase issue. I don't think it needs a buffer, but I could be wrong about that. I don't know that it needs a footswitch (the blender would take care of that itself, right?) but again, I don't really know. Are there any challenges to the blender circuit that a beginner should watch out for?