Is this script the kind of graphic equalizer you're looking for?
http://www.tutorialized.com/tutorial...Equalizer/7487
SUPER is one of the best freeware media converters. It doesn't mention cda in its features list, but might be worth trying.
For any other converters you find online, check with
Site Advisor to see if the site is safe to download from as these types of programs can sometimes contain malware.