Mad Professor Evolution Orange UnderdriveEvolution Orange Underdrive (EOU) offers a new way to approach your tone. Instead of overdriving your clean tone, now you can get cleaner tones from your favourite overdriven tone. That is what we call underdriving. Evolution Orange Underdrive works really well with vintage single channel amps that sound great when you push them to overdrive. When you turn down the volume from your guitar to clean that tone, the sound often gets bit too dark and the