Threshold control: variable from -30 to -10 dBu Slope control: variable from 2:1 to infinity Attack control: variable from 10ms to 100ms Level control: -infinity to -3dBu Low Distortion: (100 hours Inputs: One 1/4" jack Otputs: One 1/4" jack Controls:Engage switch Optional: 9 volt power supplyThreshold control: variable from -30 to -10 dBu Slope control: variable from 2:1 to infinity Attack control: variable from 10ms to 100ms Level control: -infinity to -3dBu Low Distortion: (100 hours Inputs: One 1/4" jack Otputs: One 1/4" jack Controls:Engage switch Optional: 9 volt power supply