The Grim
for me the visual scale of the meters change when you click and select between the options.
I agree this is only the visual range of meters, the more relevant question may be what level does the 0 dB represent, in Sonar and/or can 0 be changed to visually represent say like -12 dB, which I believe is an optimal/ideal peak level analog recordings should be made within?.
I know I had some uncertainties about what actual levels Sonar meters indicate. It may also be worth seeing if your audio interfaces software mixer meters indicate more or less the same levels as in Sonar. I know the preamp input levels indicated in my TotalMix (RME UFX), may not peak out in red/overload (using peak Autoset function), but Sonar meters may still overload, so usually I need to back off gain a bit in TotalMix, so Sonar meters dont indicate overloads, but then recorded levels sometimes seem somewhat low, (i.e., I have to somewhat boost my listening levels for mixing).
Cheers