The Genzler Amplification CRASH BOX-4 classic bass distortion pedal is an all-analog pedal that emulates 4 different distortion types found in popular tube and solid-state distortion circuit topologies. It then gives you additional flexibility and control over drive/gain, distortion path (only), high-pass and low-pass filters, and a clean signal path blend. The result is the ability to tailor and fine-tune the distortion to fit a wide spectrum of music and playing techniques, without the loss of touch sensitivity, musicality or the addition of excess noise. The CRASH BOX-4 has an aluminum chassis, high-quality PCBs, pots and switches, and uses auto-detecting circuitry for operation with power supplies operating at 9-18 VDC, either polarity (not included).