I don't think that's what he's asking for exactly. I think he means he wants it to display the real decibel reading for the output which is a bit different than its offset from reference.

However, it sounds like, from what you just said, this MCACC thing could in theory do that. I don't really know anything about that technology.

Is it basically some sort of ambient sound measurement hardware built into the receiver that allows for callibration?