Boost different vocal parts (bass, alto, etc.) in MP3

What I’m trying to do is adapt a Pentatonix song to piano, and what I’d like to do is to basically make 3 of the vocal parts quieter than the 4th to make it easier to then write out the music for that part.

I could always just settle for boosting the treble and the bass.

I could always just settle for boosting the treble and the bass.

That’s what you’ll be settling for, yes. There’s no convenient way to split up a quartet into individual performers. Although we can do better than treble and bass controls.

http://manual.audacityteam.org/o/man/equalization.html

Koz