Besides the typical Level, Tone and Drive knobs which obviously control the volume of the signal, the tone and the amount of overdrive, Carl has smartly added a clean boost after the drive section, and a Regular/Fat switch….not so typical. In Regular mode, the drive is crisp and clear, suitable for anything that calls for old-school drive….switch over to Fat and the drive gets thicker with a lot more gain, much more modern. Anyone who knows the Carl Martin line is familiar with his Clean Boost….a bump-up in signal volume that can be used either with your clean or overdriven sounds. The result is a multi-use pedal that allows you to have a variety of rhythm and solo volumes at your feet. Like the rest of the Vintage line, the DC-drive comes in that cool retro diecast housing with the equally cool chicken-head knobs and CM graphics. The pedal can be powered by 9v battery but we recommend a regulated power supply like the Carl Martin ProPower.