I'm playing around with some old Realbook tunes and I'm running into an occassional issue where, as soon as I start up a song after editing the volume levels, they all revert back to about 60%. This is happening with just some of the tunes, so I'm wondering what's special about them such that they resist the changes in volume. I've looked through the preferences and a few other locations and can't find anything that would seem to indicate why this is occurring. What have I missed?