The I.Q. Compressor is an EQ/Compressor with a pre-compression EQ. The EQ allows you to choose which frequencies you want to be compressed harder based on their respective gain setting. Each frequency slider has 18db of gain or cut. The compressor has a volume and mix control. The volume control increases or decreases the output level and the mix control simply blends the compressed signal with the dry signal. (There will be a slight bump in volume as the mix control blends dry with wet). It can be adjusted with the volume control.