Okay, here goes. Relatively new to the guitar world, playing an American Special Stratocaster through an Orange Crush Pro 60 combo amp. Been researching overdrive pedals lately, digging the Boss OD-3, and Blues Driver pedals. Here are my questions: Are pedals primarily designed for tube amps? My amp has a dirty channel already. Would an overdrive pedal make much difference, or would I be wasting my money?