hey, im new to this but it seems theres a few things ya might try.
How does it sound when you play back in Cubase? And more importantly, how do you monitor it? If you listen through 'regular' headphones, they'll probably exacerbate a low end and will sound different to how it was originally recorded; theres alot to consider when thinking of Equalisation, and thats why im gonna talk a little about monitoring...
If you have good quality studio monitors, these will portray the sound accurately. If you're monitoring through a stereo amplifier (like a home hi fi) the sound will be biased depending on the stereos EQ settings, and will obviously vary from stereo to stereo. In my case, my song sounds great through my monitors, but suffers a little thorugh my laptop/desktop speakers.
If this ISNT your problem, then I would say its either the quality of the sound going in (how good your mics, guitars, technique is) or the sampling and bit rate of your sequencer and sound card. Im a little unclear as to what exactly your problem is...do you just think it could sound better? Mastering is an art unto itself, and would take practice, and without knowing your approach and what you're recoridng, itd be tough to give advice. So here are a few suggestions:
Double Track Guitars: Record your guitar part and copy it into a new track. Pan one 70/30 left and one 70/30 right. You could add a lttle reverb to one or change the EQ curve of one to vary it somewhat.
Experiment with Compression: Try it, you might HATE it. Its a black art but can improve your sound alot, making certian things more 'punchy'. I use it alot for guitar as it evens out the volume produced by each string.
Quantize and Compress: When your track is done, leverls are right, bounce the whole thing back into Cubase, Quantize it and the Compress it.
Hope this helps, im very new to this.
