Mad Professor The Green Wonder

An updated version of the popular Little Green Wonder, the Mad Professor The Green Wonder is a high-output overdrive/boost pedal optimized to sound great with single coil and humbucking pickups and different amplifiers no matter if clean, overdriven, or distorted.

It delivers the uncompressed and touch-sensitive tones of the predecessors adding extra Bass and Treble controls requested by many players who loved the original.

The Bass knob’s range goes from a slight low-frequency cut to a significant low-end boost, while the Treble one can make your tone warm and smooth or bright and cutting.

Here’s the presentation video of the ad Professor The Green Wonder.

Mad Professor The Green Wonder, Builder’s Notes

THE GREEN WONDER is a versatile high headroom overdrive/booster pedal, that has high output and sounds great with both single coil and humbucking pickups. THE GREEN WONDER works extremely well with different kinds of amplifiers and can be used with both clean and overdrive channels, even with heavy distortion. THE GREEN WONDER is ideal also for players seeking a pedal to stack with other pedals!

THE GREEN WONDER is an updated version of the legendary LITTLE GREEN WONDER. Everything you loved with the classic LITTLE GREEN WONDER is included in the new and carefully fine tuned THE GREEN WONDER. But also everything you might have missed is now there, as we have listened to the wishes over the years.

THE GREEN WONDER has added Bass and Treble controls, that allow you to really dial in your low and high frequencies depending on other gear you are using. And whether it is warm vintage tone or brighter modern tone, THE GREEN WONDER will deliver. We have added a ton of versatility to the classic and made it into a truly powerful tool!


VOLUME: Sets the overall output level of the pedal. Even when used as a clean boost, The Green Wonder provides enough level to push the front end of the tube amp into natural clipping.

DRIVE: Sets the level of overdrive. Set counterclockwise for low overdrive or a boost and set clockwise for more overdriven tones. This will take you from clean boost to bluesy crunch, and also to rock overdrive. Tight and heavy distortion can be obtained when The Green Wonder is used with other overdrives.

BASS: Sets the low end of the pedal. Adjustment range is from a slight low-frequency cut into a significant low-frequency boost. Good starting point is at 1 o┬┤clock.

TREBLE: Sets the brightness. This takes you from warm and smooth into bright and cutting tones. Good starting point is at noon.


Input impedance: 500kOhm

Output impedance: 10kOhm

Complete bypass (true bypass)

Max current consumption: 4mA at 9VDC

Supply Voltage Range: 7V5-18VDC

The unit has high input impedance presenting only a light load to the pickups, and the volume control on the guitar can be used to control the gain.

The output is designed to work with medium impedance of a guitar amplifier and most effect units.

Never operate the unit with its bottom removed or damage will most likely occur.