Mad Professor Evolution Orange Underdrive Pedal (EOU)This is a Brand New Mad Professor Evolution Orange Underdrive (EOU) Pedal. Like rolling down the volume on your guitar to "Clean Up' your tone the Orange Underdrive gives you a pre set level in pedal form. When you roll down the volume your tone can get dark and muddy. The EOU brings the Sparkle back. The EOU has Treble Bass and Midrange controls in addition the the Volume Cut control. It can also be used as a Boost by pushing the Mids and Volume up.