Arthur Hine asked in 040112 MMDigest:

> Has anyone had success in re-recording MP3 band organ files using
> an equalizer or DSP to improve fidelity and/or tonal balance?

Depending on the class of MP3-compression (128 kbps sampling rates and
above are known as CD-quality), you have to bear in mind that some sort
of psycho-acoustic tricks are used for reducing file size, and therefore
you will loose something when re-converting in order to apply sound
improvement techniques (if possible) like noise- or hiss-reduction,
pop-elimination, or even advanced methods like FFT filtering and so on.

Claus Kucher
Vienna