The BYOC Spring Reverb features the Belton BTDR-3H. The Belton BTDR reverb modules have quickly become regarded by DIYers and boutique pedal builders as one of the best digital spring reverb modules ever. Despite it's clunky size (which has earned it its nickname, "The Brick"), it's easy to design around, is low noise, and just sounds better than any of the DSP reverb modules. With Reverb Level and Dwell knobs, you can dial in anything from just a subtle hint of vintage spring reverb to giant cathedral reverberation that lingers forever. Surf to New Wave. Rockabilly to Garage Rock. The BYOC Spring Reverb has it covered. It can run on a single 9v battery or 9VDC power supply, but it can also use an 18VDC power supply for increased headroom.