The Keeley Compressor effect has nothing but tone tested components and has TRUE BYPASS switching!!! Effect switching incorporates a triple pole-double throw switch! You will have clean unaffected sound when in the bypass mode AND an LED for effect indication. Metal film resistors and capacitors ensure the cleanest compressor on the market. Hand matched transistors to less than 1% tolerance ensures you get a perfectly compressed signal, no chance for unwanted distortions. For those wanting a better tone than that of Trey Anastasio from Phish or David Gilmore of Pink Floyd or the Edge of U2 this is it! Nashville/Country guys...boy, you don't know what you're missing, toss the old red Dyna Comp and stay one step better than the other guy's tone! The TOP Studio Guitar Player in Japan, Masaki Matsubara, uses a Keeley Compressor! The Top studio guitar player of Puerto Rico uses a Keeley Modded Blues Driver and Keeley Compressor.