Experience lush, dynamic auto-wah effects with the used Guyatone ULTRON GST-U05, a versatile envelope filter pedal in good condition. Featuring analog circuitry with digital control, the ULTRON offers both envelope and LFO-triggered filter sweeps, giving you expressive, customizable tone shaping perfect for funk, rock, or experimental styles. It provides adjustable sensitivity, attack, decay, rate, and depth controls, along with a unique tap tempo function and expression pedal input for real-time modulation. The compact design includes stereo outputs and true bypass switching for pristine signal integrity. This unit shows light cosmetic wear but functions perfectly, delivering the warm, responsive tone Guyatone is known for.