Classic blues driver circuit enhanced by decades of modification expertise. Germanium-based overdrive developed with Andy Timmons' guidance. The AT/RK Tone Switch reduces low frequencies for enhanced clarity or boosts the low-end for added power, and the AT/RK Drive Switch toggles between asymmetrical silicon and dual germanium diodes. Buffered Bypass or True-Bypass - switch instantly based on your rig's requirements. JFET Transistors, Germanium Diodes, and Op-Amp Gain combine to create a harmonically rich overdrive