The Keeley Compressor GC-2 Limiting Amplifier is built around the exotic and extremely high fidelity THAT Corp. 4320. Think of it as a very musical studio-grade compressor in stomp box format It uses high performance Voltage Controlled Amplifiers, on board true-RMS detector, and ultra high performance op-amps to bring you the very best quality. This type of compressor gives you precise control and very musical results. This along with a full frequency range means that this compressor is well suited for guitar, keyboards, drum machines, really, anything you can throw at it. The Keeley GC-2 Limiting Amplifier is both musical and very transparent. Where Keeley's older compressors were based on the CA3080 or the LM13700 and are perfect for that 'Compressor Effect', the new Keeley GC-2 is a different style compressor, aimed at being the ultimate in low noise and transparency. Not only can it handle astonishingly large signals, it has an incredible bandwidth of over 20 KHz. No detail in your guitar's tone will be lost. The Keeley GC-2 will be a sound investment in your tone, you now have genuine rack-mount quality at your feet.Compression and ThresholdWhen musicians use the new Keeley Compressor - GC-2 they will be greeted with a sound that is more easily amplified and heard. Using the effect as a limiting amplifier saves your speakers from clipping and distortion. Set the Threshold to look for peaks in your signal and limit distortion from your amplifier or damage to your speakers. Simply watch the Threshold Indicator light to see what type of playing you want to limit, it's that easy! Next set the Compression Ratio Control to determine how much squash you want when the signal is above Threshold. Set Compression all of t