PETTYJOHN ELECTRONICS PREDRIVE PREAMP STANDARD EDITION. Rarely do the worlds of studio gear and effects pedals collide; expensive studio pieces aren't compact enough or built for stomping or the rigors of the road and stage. Many effects pedals exhibit too high a noise floor, or require a lot of babying in order to be properly utilized in a studio. Be that as it may, Pettyjohn Electronics has developed the missing link: an ultra-high end piece of studio equipment masquerading as an effects pedal. Meet the Predrive.