Mad Professor Snow White Auto Wah for Guitar and BassBJF design guitar and bass Auto Wah Voltage Control Filter pedalHand made in Finland premium quality auto wah pedal. The SNOW WHITE AUTOWAH (SWAW) circuit is based on a 1991 BJF rack mount remote wah circuit and is tuned like a real wah. The circuit was redesigned with envelope controls and built into small size pedal. It has very fast tracking and accuracy rarely found on auto wahs envelope filters. With the four knobs you can have total control of