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→Sag
=== Sag ===
Controls the amount of power amp sag, which is a dip in voltage over a sustained load. I find it mainly causes a slower attack and a chunkier bottom end. See [http://en.wikipedia.org/wiki/Distortion_%28music%29#Power_supply_.22sag.22 this wikipedia entry]. Lower settings offer more of a dynamic attack and tighter feel, but can change the tone.
In general I leave this alone until I've made almost all my other tweaks. I'll use it to add more/less attack to the tone. I usually stay within 40-60%. Lower settings can make the tone a bit edgier bit thinner. If I want to thicken the tone up, I usually add Decay in the Cab DEP's to do so. But sometimes, I like to turn up both Sag and Decay to get it extra thick.