The Gamechanger Audio Light Pedal Optical Spring Reverb System is the world’s first analog optical spring reverb system that uses infra-red optical sensors to harvest the full timbral and harmonic range of a spring reverb tank.

It takes a lot of energy to transfer an audio signal across the length of a vibrating spring. By the time the source audio signal reaches the spring tank’s output transducer, most of its nuanced harmonic content will be lost converted into mechanical energy.

This is why spring reverbs have such a particular sound, since what you end up hearing is largely the spring’s own resonant frequencies.