I'm looking for software -- compatible with Linux or WINE -- that will read a digital music file (like .mp3) and output a text file with numbers that show the loudness in each frequency band. I specifically do not want visual/graphic output. I want to use these numbers to add tags to .mp3 files to let music player software automatically adjust the equalization for each tune.
A plus would be a means to adjust the target equalization so I could, for example, increase the overall level of treble in my music collection; another plus would be to generate .mp3 tag data automatically.
If it has all the features I need, I would be willing to pay a reasonable price for it.