Re: On air compression
@CrazyOldCatMan - You need to research "ReplyGain" for your music system. It adds a parameter which has the effect of turning the volume control up or down. In your (our) case it turns newer 'Remastered' discs down, and leaves older original discs alone. No more volume jumps.
It's been a while, but I updated my entire library with one line of command-line voodoo (Linux) and since then used Foobar2000 for everything I've since purchased.
Totally worth the effort.