The Supro Boost pedal sports a simple control layout with a single Volume knob and an oversized toggle switch to select BRIGHT, FLAT or DARK overall frequency response. The BRIGHT mode enables a 3db/octave HP (high pass) filter. This setting is useful for thinning out humbucker guitars when adding boost to increase sparkle and prevent mud. The DARK mode enables a 3db/octave LP (low pass) filter. This setting is useful for fattening up single coil guitars when adding boost, to increase warmth and prevent harshness.
Taking the boost pedal one step further, the Supro Boost offers a TRS port for expression pedal control of the VOLUME knob. This effectively turns the Supro Boost pedal into a high-fidelity, active volume pedal with user-adjustable minimum and maximum settings. With the expression pedal in use, the on-board VOLUME knob sets the maximum value while a user-adjustable, internal trimmer sets the minimum volume. All Supro pedals are assembled in Port Jefferson, NY, USA, featuring custom-tooled, anodized, brushed-aluminium enclosures, 9V battery or AC powered operation, rear-mounted metal jacks, easy-access side-mounted battery drawer and studio-friendly, noiseless (click-free) true-bypass switching.