What would be the most cost effective and user friendly software for doing
post-production work on a studio-made CD? I am a musician and an electronics
engineer.

I have a four song studio-recorded CD with some vocal pops, slightly thin
sound, and other technical flaws on some of the cuts. I'd like to improve it
one cut at a time using filtering, EQ, ambience/reverb enhancement, etc.
After optimizing all four cuts, I want to burn them onto a CD-R for use by
Disc Makers as a duplication master.

Opinions would be greatly appreciated.