The correct way is to mix with the faders!. To understand why, you might want to visit Harmony Centrals site and do a search on “Gain Structure.’ This is one of the primary reasons house tech’s have such disdain for DJ’s. Red lights blinking anywhere in a system,(be it amps, channel strips, or main output) are a warning. To many DJ’s don’t even have a basic understanding of how a sound system works. Do yourself a favor and get a basic understanding of how a high powered system works. The gain knobs should be set and left alone.