Check the listing for details. MINI C4 Compressor Guitar Pedal Compressor Effect Pedal True Bypass. Condition: New. Listed at 66.80 USD. C4 Compressor Guitar Pedal Compressor Effect Pedal True Bypass for Electric Guitar Musical Instruments The C4 is a boutique compressor that can add some vintage-sounding push and squash to your sound. it's no-nonsense design, you can easily tweak your perfect sound with 4 essential controls. this compressor adds definition and a transparent musical squeeze to your sound unlike any other. This pedal also features True Bypass switching, meaning that your guitar sound is retained when the pedal is off (although this isn't something you'd turn off very often - it's that good!) The pedal have included only the most necessary controls to give you an easy to use pedal with many applications. The Sustain Control The 9 O'clock position should be barely noticeable. It will just take out really loud sudden peaks, this is great for protecting your speakers and the like. The 12 O'clock position provides the right presence for using the compressor pedal continuously while performing. The 3 O'clock position is great for solos. It really adds some cool effects to your playing dynamics. Only when really cranked do you get the pluck sound of your pick emphasized. Attack Control The compressor pedal has an Internal Attack control, designed for bass players with high-output active pickups or active pedal boards with buffers. Clipping Control The compressor pedal also has an Input Sensitivity Control, meaning you can use this in your studio to run keyboards, drum machines, drum mics, even master recordings and other line-level uses. You'll raise your signal to a new level of sonic awesomeness. True-Bypass Switching Circuit True bypass means that when the effect is off your guitar tone will not be affected at all. The true bypass circuit makes sure you have absolutely no tone loss or signal reduction through the compressor pedal in the off/bypass mode. This switch makes sure you have absolutely no tone loss or signal reduction through the 4-knob compressor even in the off mode. Other compressors use a cheap switch and design that runs down your signal even when off or if the battery goes weak. Power supply The DC jack is the standard type fitting just about every power supply out there. Power: 9VDC, Negative Tips (Regulated recommended)(not included) Dimensions (L/W/H): 94(L)MM x 39(W)MM x 32(H)MM Weight: 165g Package included: Only the pedal