Compression, compression, compression!!!
That’s the magic word in the recording industry. ALWAYS use compression on individual tracks as you’re recording the multi-track masters, and then, put your mixer’s master outputs through a compressor again while mixing down to a 2-track master. (This is where a patch-bay comes in real handy). About the only thing you don’t need to compress is a drum machine, since the drum samples are already compressed. Not only will compression keep your levels nice and even, i.e.-will bring the low volume sounds up and will bring the sounds that are too loud down, but there are certain instruments that just seem to breath and sound more open and natural with it. This is especially true of acoustic instruments. I can’t imagine anyone getting a good guitar sound (electric or acoustic) without the use of a compressor. And forget getting a decent vocal without one!
I still think Cool Edit is the way to go for you. It has compression and limiting that’s very adjustable, and also has several different types of EQ to choose from, which might be of help to you. Also has reverb, delay etc…
The old Pros always say that the best EQ is "NO" EQ and that’s certainly true. If you use the right mic and position it correctly in the right sounding room, you should never have to use EQ. Unfortunately, most of us don’t have thousands of dollars to spend on mics and such, so we use EQ and do the best we can.
Try Cool Edit. You may never get your wav file to perfection but you can certainly make it better!
Good Luck!