I've been looking for an overdrive pedal and have watched more vids than I care to on youtube. I really like the Mesa Flux Drive, but don't know if I can bring myself to spend $179 on it. Really would like something around a $100. Anyways, listening to all of these pedals got me thinking about how these pedals really work, or any others for that matter. Do these overdrive pedals actually boost the power of the amp causing the overdrive or is it the inherent sound of the pedal itself that is amplified through the amp? Or neither?