Most of the classical type music that I listen to have violins on the left and cellos/bass on the right.
 
For some reason, I have a set of classical mp3s from long time ago that I just dug out, and the left and right channels seems to be flipped around (violins from the right and cellos/bass from the left). I'd like to flip the channels so it is consistant with all the other classical music that I have. However, I don't have the CD anymore. I tried finding it at home and don't know where I stored it.
 
Since I don't have the CD, I can't extract the original tracks and do the audio channel flip with the original uncompressed track. However, I don't want to decode the mp3 to wav, edit, and reencode it, which will yeld a lower quality mp3 than what I have right now.
 
Does anyone know if there is a program out there that can do direct MP3 editing (without decode and reencode) and can do audio channel fliping?