The Rocktron HUSH Super C Guitar Noise Reducer exterminates annoying hisses and hums in any combo amp, 1/2 stack, or rack system! The Super C noise exterminator is designed specifically for guitarists (especially gain-heads) who require noise reduction without compromising tone. The Rocktron HUSH Super C allows notes to sustain without being gated or cut off while working on subtle dynamics. Only takes up a single rackspace.