ReplayGain

[simbun]

I can't confirm whether those tags are used but one way to check would be to split the mp3 file into chunks and apply different gain values to the alternating pieces, then play it back (making sure to change the tracknumber of the parts so they're played sequentially).

I use this track splitting approach to test if a renderer supports gapless playback (can test multiple track transitions quickly) where I use sox to perfom the split:

Code:

sox 01.01.flac 02.%2n.flac trim 0 20 : newfile : restart

EDIT: Looking at wikipedia MP3Gain appears to edit the audio itself (information on how to undo the changes are stored in the tags, not the gain itself), so there's nothing to apply in MinimServer.