If your collection is encoded with the DSP Replay gain already, it will auto level to that same level.
But of course, this is with dbpoweramp and foobar, not sure about other programs.
But yeah, the later is what I thought/another option to pursue. In the sense of encoding all your music with replay gain so that it auto sets to a stable volume.
ClieOS said that its not supported on the X3 when I asked in the X3 thread:
volume normalizer is not supported
So I'm confused. You are saying it is enabled automatically on the X3 and the X3 is normalizing the sound if a replaygain tag is available ? Or are you trying to tell me how to use it? I KNOW how to use it