one of the cool features of this -
you can walk up to someones car, plug this in and without touching ANY dials, see what their overlap ALREADY is. I am betting there is gonna be lots of people pulling up to shops with their bass amp at +28db overlap and +22 on their mids/highs LOL
how about this, you set the gains on someones system for them. You record the overlap settings. He comes back a week later, you can plug in and see if they have been touched. Imagine how many "friends" have turned up a properly set +5db overlap to +26 for someone because "it is louder" that way. As an installer, you can see right away what was touched. This is a great tool!