Finally managed to drag my Scope rig out of storage after a protracted house move and boy have I got some catching up to do

D/L'd the fab VM 2412 and ran some comparison tests on a drum track last night to have a listen at this new fangled Valve simulation thang that seems to have appeared in my abscence.
When I switched to the VM I nearly fell of my seat, quickly had a quick look at the meters as it sounded off the scale however the signal was actually 1db less than the original! Spent the next hour trying to understand why

Loved the sound but I am tying myself up in nots trying to work out why I perceive this as being so much louder when it plainly isn't?
Fletcher Munsen?
Any help appreciated.
Simon