Compression (depending on genre and feel) - I normally use light compression with most of my tunes, though in techno music these days it leans to a more heavier compression (from what I've heard).
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Stereo enhancing - Just general Stereo seperation to widen the mix of all your instruments so it doesn't sound too crowded. Along with that, panning your seperate instruments works a treat too ;).
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A global EQ at the end, maybe as a bass boost or a treble booster - something small to just give the tune that little bit more umph :]. . .
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That's what I do anyways, hope that helped ^__^__^.
TacoFreak
herro
Reaper93
hai2u