Not much to it. Hit Utility menu button and page over to the VU page. There's 4 meters. L1 and R1 are for Output 1. L2 and R2 are for Output 2. Below the meters it shows the current output setting for Amp Blocks 1 and 2 and you can use knobs A and B respectively to adjust these on the fly. It also shows a percentage value for the current settings of the front panel output knobs as well, but these have no affect on the meter since they are after the D/A converters. The meters show the relative loudness of the signals going to each output for the current preset. The meter displays a range of -20dB to +10dB. The vertical line on the meters marks 0dB and is the sweet spot for average preset levels. The positive portion of the meter to the right of the line is for peaks and headroom. Just play through your preset and adjust the amp blocks output values with the A and B knobs until the output level averages close to the vertical line (0dB). The fast peaks will go above the line and that's OK. That's the point of leaving that 10dB of headroom. It also gives you enough wiggle room for things like lead boosts and such. When you've got your level the way you like it, hit the Store button and Enter twice to save the changes to the current preset. Switch to your next preset and repeat the process until all of your presets meter out about the same average level. Keep in mind that if you are using both X and Y states for the amp blocks, the A and B knobs adjust the output levels for the current state of each amp block, either X or Y, whichever is currently selected. You'll have to switch to each X or Y state and adjust them separately if you use both in the current preset.