I'm looking for a tool like this, but not quite sure what to call it. I have a number of MP3s of recordings I did on 4-track tape back in the day. I quite like them but the recording is fairly poor and lacking in bass etc.
I also use FL Studio, in which I have an effect called Soundgoodizer, which just seems to be some presets of http://flstudio.image-line.com/help/html/plugins/Maximus.htm. It doesn't really have any controls but adds a lot of oomph and crispness to the sounds.
What I'm looking for is something similar that I can run my mp3s through. I don't really want to have to convert them all into WAV files, import them into FL Studio as audio tracks (some of them are around 40 minutes long) and then export the whole thing again. There must be something that will just import an MP3 directly, equalize, compress and do whatever else the Soundgoodizer does (with sensible presets but the option to tweak), and then save it as a new mp3?