Thank you for your reply, it's much appreciated; all my tracks are adjusted to Track Gain, as I listen to my music in shuffled Playlists, however, something is happening that I don't understand...
I opened one of my Playlists where I've noticed the differences in track volumes and clicked on Tools/Restore Original Volume.
I then went back to Tools/Analyze Volume and applied Track Gain to every track, including checking for Clipping.
I randomly checked some of the tracks, there are 57 in the Playlist, by Right Clicking then going to Edit/Tag Inspector and can see the Replaygain Track Gain and Replaygain Track Peak values assigned.
Then here's where it gets weird... I went to Tools/Tagging Tools/Other 'Files to Edit' Filters/Show Files With No Volume Analysis, and out of the 57 tracks in the Playlist, 22 are shown as having, "No Replaygain Tags."
Right Clicking/Edit/Tag Inspector on each individual track in the list shows me the Replaygain Track Gain and Replaygain Track Peak values.
Do you have any idea what's going on?