How to equalize volume in iTunes for Apple Music Library?

I use Apple Music, just for the iTunes end of things, no streaming it is simply my library and I still synch a few portable players; nano and classic when I add a new album or CD someone sends me.

I would like the volume; standard / normalized / equalized...whatever the proper term , on all of my music in the library, which consists of the digitalized versions of all; my old vinyl, cassettes and CDs. As well as the more recent downloads from iTunes Store. An antiquated way to go about things, I know, but that's where I'm at.

So, is there a way to get all these tunes (18,550) to playback, at the same volume?

Eliminating the need for me to make continuous adjustments on the fly, in the gym on my bike, etc.

Of course, the "adjustment" if possible, made in iTunes, on my Mac, would need to be replicated during the synch, for it to actually be a benefit.

thanx

[Re-Titled by Moderator]