First start with a superior synth to reproduce the midi better. You should never polish a turd. A bad sounding synth will remain so for the most part.

Next try placing a multiband EQ on the FX bin for the track place a spectrum anaylizer in the second slot something like Span http://www.voxengo.com/product/span/ and take a look at offending freqs and ones that are diminsihed. make the adjustments in the EQ and then bounce or render that track to a wave track and it is locked in. This has worked well for me. I also will take the same effects and give the master output a last look and try to even out the frequencies.


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