The plugins I place on my main out to monitor levels do not seem to match the levels on individual channels. I realize this is a sum of all channels, but for my example, I wanted to see how accurate the VU meters are. Using a tone generator and the VU meter, I solo a track, set the level to -18db and the VU meter correctly reads zero and using a level meter I can see the level is -18db. When I keep the tone generator going to my master bus, using the same VU meter, the reading is much less than the -18db. If the master bus is the sum of all of my mixer channels and i have this one on solo, why are the meters not the same? My mixes were sounding off and I could not figure it out until now; the readings on the master bus are totally inaccurate. What gives?