Yep, thats d way 2 do it. Works with Waves C1, Slim Slow Slider Sidechain Comp, Sonalksis Comp!, DB Audio Comp, and a few others.. didnt use to work with most plugs before but now its more common..

Start with the Ratio around 1:80 and Thres around 28.0db and play about til it works.. !!

.Kool.