Up for sale, a 1981 Boss TW-1 Touch Wah “Silver Screw” effects pedal in collector-grade condition and in perfect working order, complete with the original box and all paperwork/ephemera. Produced from 1978-1987, the T Wah (Touch Wah) was Boss’ first compact filter effect.

The T Wah applies an automatic wah effect to the signal, with a dynamics sensitive response. The more you dig in, the more the effect is applied, while the Sens (Sensitivity) knob determines the trigger threshold. The Peak knob controls the tone, and the Drive switch toggles between Up or Down settings, essentially mimicking the motion of sweeping up or down on a standard tilt-based wah pedal.

This T Wah has barely a mark on it. The original knobs are intact, along with the black foil “Made in Japan” label. The serial in the battery compartment dates production to April, 1981.