The Fairchild manual documents Time Constant settings 5 and 6 as user presets—although you have to go inside with a soldering iron to change them. We used the “factory default” values.Settings 7 and 8 do not exist on real-world units—well, at least most of them. These settings are taken from a real-world Fairchild modification invented by Dave Amels many years before he designed the plug-in version.What do they do? Settings 7 and 8 offer versions of Time Constant 2 with a gentler release useful for compressing vocals and other program material where you desire more subtlety in the compression action. Give them a try—you’ve already heard them on hit songs on the radio.With a carefully adjusted Input Gain and Threshold, you can use Time Constant 1 to achieve a cool pumping effect on drums. The sound gets darker and fuller, and sits beautifully in a mix.