Interesting point. I just checked and I'm using the 0-98 scale vs. the dB scale, and I'm quite sure that the other sites are using the 0-98 scale as well...It feels like something has changed...
(Side Rant - What is it about audio manufacturers that cannot get the concept of 0-100/0%-100%??? Is it really so hard to understand that this is how the people that are paying for this would best understand things???? ?I know, pro audio guys think differently, but AVRs are not pro Audio devices...)
And I definitely agree that turn on/turn off levels need to be managed for the exact reason that Michael mentioned. I've chose to deal with it programmatically, setting a turnon volume of my choosing on start up, and setting the volume to '0' before sending the off command.
I also have built volume governor logic to programmatically manage the max volume. In a properly calibrated system, I feel that it is not really necessary to go much over reference (0 dB). some devices like the sony avrs will allow +23 dB OVER Reference!!!? I have a parameter to limit this...
The one downside to managing the volume range is that if you use the AVR OSD, the volume display will not match your UI level display - I personally like to turn the OSD off, but some of my dealers like to keep it on...