Seymour Duncan 11900-006 Vise Grip Compressor Pedal w/ 2 Patch Cables Compression Ratio: Soft-knee, adjustable from 1:1 to &gt; 20:1 Maximum Compressor Gain: +50dB Attack Speed: Adjustable from 2.0ms to 50ms Input Impedance: 1 Megohm Distortion: &lt; 0.3% at 300mV RMS output at 1 kHz