Normalize is good for Ys IV tracks that are REALLY low preamp-wise when you wanna rip tracks for playing in an audio system! I learned about this problem years ago and consulted with Justus Johnston which led to adding normalize...
I wouldn't use it for making CD-Rs to play on your NEC console! Only when you want MP3s for your music playlist to listen on the go!
If you're willing to experiment because the background music seems too low, you can I guess, but that wasn't the thinking behind it as we're changing preamp volume levels from what the developers expected. You'll affect balance between PSG sound effect volume obviously.
But yes, some CDs are recorded with preamp volume levels stupidly low and if you rip tracks raw, you'll have to fully blast your audio receiver system to enjoy them as I found with Ys tracks!
I used normalize for my Ys MP3 tracks here for example:
http://www.ysutopia.net/audio/http://www.ysutopia.net/audio/YsIII-07-The-Boy-Who-Had-Wings.mp3
