AEROLITE COMP is designed to bring you greatest compression effect together with retained infinite sustain of the original tone! AEROLITE COMP is equipped with an INPUT switch suited for High, Middle, and Low Input adjustment; COMP control to set the amount of compression and sustain; ATTACK control to adjust the dynamic and touch-sensitive attack; MIX to adjust the original signals and compressed sound to gain ideal tone with a superb compression and retained infinite sustain of the original tone. When adjusting MIX CCW to the minimum, the AEROLITE COMP can be used as a BOOST for Guitars, Basses and other musical instruments. True Bypass design minimizes tone loss.Well built little box.Hand soldered. Rugged metal case. No tone loss with True Bypass 3PDT foot-switch Affordable Price, Luxurious Sound !THIS WAS TAKEN FROM A BLOG SITE AND THIS IS WHAT THEY SAID.Quote:The Aerolite Compressor from Dr.J Pedals is a unique pedal in a sea of compressors, as it has a couple of variables that enable it to sing a different tune than most. The COMP knob obviously controls the amount of compression you are applying to your signal, and the OUTPUT controls the volume boost coming from the pedal itself. The ATTACK knob, another compressor staple, adjusts the dynamics and reacts to your playing, depending on how hard or soft you’re picking the strings. Here’s where this little guy gets fun…A MIX knob controls the amount of Wet/Dry signal coming out to your amp, which should be a necessity on ALL compressors. It allows for such fine control of your compressed sound that there’s no way you wouldn’t be able to dial it in to perfectly fit your needs. On top of that, if you turn it all the way down, you can use the Aerolite as an awesome clean boost – it’s like 2 pedals in one! And to top it all off, there’s an INPUT switch as well, which varies your input signal to the pedal in 3 degrees: High, Mid and Low, so you can further customize your tone (I like the Mid setting myself).Compressors come in all different shapes, sizes and prices, as well as different functions, abilities and tones. The Aerolite from Dr. J is just about the best compressor on the market in its price range, and one of the best I’ve played through period. A great, transparent compressor with tons of sustain and lots of flexibility, don’t sleep on this sweet pedal form Dr. J Pedals. Unquote:Features: Mix ControlAttack ControlOutput ControlComp ControlHi, Mid, Low 3-way Switch LED indication lightsTrue Bypass Specifications: Input Impedance: 1M OhmsOutput Impedance: 10K OhmsCurrent Draw: 10mAPower: 9V DC adapter or 9V BatteryWeight: 265gDimensions: MAX 100.5(L) x 82(W) x 57(H)mmNote: Power supply not included. Please use the 9V DC power adapter whose polarity is negative center otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese) 1 * Year warranty through our store No Duty to Canada and USA FAST 'N FREE USA Shipping ( usually about 4 days via USPS )Ships from Canada*Just to be clear on DUTY, (regardless of what eCRATER warns buyers of ) Canada and the USA have a trade agreement in place that allows US citizens to purchase/import up to $800 dollars per purchase in to the United States from Canada with NO Duty at all, State taxes are another story, some states charge a TAX some do not, BUT NO duty