Velleman K8110 is a DIY tremolo effect pedal that allows guitarists to add a pulsating, wavering effect to their sound. With its versatile controls and true bypass switching, the K8110 provides a wide range of tremolo effects, from subtle pulsations to intense, swirling modulations. It features controls for speed, depth, and waveform, allowing users to tailor the effect to their desired sound. The pedal also has a built-in LED light bridge for visual indication of the tremolo effect.