Bassist of the legendary metal band PANTERA, Rex Brown acquired his Pro Series II Wah in the 1990s. His devastating tone can be heard on the classics The Great Southern Trendkill and Reinventing the Steel. The MORLEY OLD BLUE is a recreation of Rex's Pro Series II, using the same components and circuits as the original, with a sweep customized to Rex's preferences. The old school design of this circuit offers an intense sweep and high immunity to electromagnetic interference. The MORLEY OLD BLUE also features switchless activation, a Wah level adjustment with 15 dB of boost, a Premium Buffer circuit, LED activation indication, and a phosphorescent logo.