Adjust the Input Gain and Threshold controls together on both channels until you get the sound you want. Like many classic compressors, after a little bit of tweaking, you’ll know immediately when you get it right.Sets the input level to the unit and the compression threshold, just like the Input control on an 1176. Full clockwise is loudest.Adjusts the gain to the sidechain, just like the Peak Reduction control on an LA-2A.Selects the attack and release times. One is fastest, and six is slowest. Seven and eight are custom presets. See Fairchild 670 for details on these custom settings.Lets you select Left/Right processing or Lat/Vert processing of the two channels. Left/Right works like a dual-mono compressor with separate controls for the left and right channels. In Lat/Vert mode the top row of controls affects the in-phase (Lat) information and the bottom row of controls affects the out of phase (Vert) information. Although originally designed for vinyl mastering where excess Vert (vertical) information could cause the needle to jump out of the groove, you can use the Lat/Vert mode to achieve some amazing effects – especially on drums.