When I sync to a USB drive and select "Level Volume", it appears that it levels the files to the default or "zero" point (i.e. as if I had the slider at zero for volume analysis).
I did a test where I used volume analysis on an album with the slider at +5 dB then synced to the drive using "Level Volume" and then examined the resulting file and it has the same gain as without the +5 dB Volume Analysis adjustment.
So, does the "Level Volume" setting just ignore the replaygain tags and set the standard target volume? (-18 LUFS I believe..)
The USB drive is for my vehicle, which does NOT use replaygain tags or have an adjustable pre-amp setting. So, If I level the volume when syncing to the USB drive, in the vehicle, the USB drive songs are noticeably quieter than the radio.