I recently got a Boss ODB-3 pedal. When I switched it on, I got a volume boost, but no overdrive. I played with the knobs, but I couldn't get anything out of it. I took it back to Guitar Center, and it worked just fine. I took it back home - nothing. I used different cables and power adapters. All of my other pedals work just fine. I tried it in my chain and by itself. I took it back to Guitar Center and returned it. I decided to go with a TC Electronics Cinders Overdrive. I have the same problem with this one. I can adjust the tone and volume, but I'm not getting any overdrive no matter what I do with the drive knob. This makes me think it's not the pedals. I'm not sure what to do. I run a Fender clone through a Fender Rumble 100 combo amp. Any advice is appreciated.