For me, I'm sorry, but I don't believe the solution to the problem is to try to edit the Roland piano to be as bright and as brittle as you would like it to be. I really believe the answer is to adjust your ears away from the hype they've been subjected to, and learn to accept the piano sound as a more realistic impression of the real thing, than an EQ'd and compressed up facsimile...
The more you listen BACK to recordings you've made (rather than worrying about whether it'll 'cut' like you are used to while you are actually playing), the more you'll come to realize that the unhyped sound of the Roland piano is what sits in a mix perfectly, without jumping out.
For us, playing live, it's harder to appreciate when we are used to cutting through the densest mixes, but personally, I'd rather miss out on the 'EZ hearing' part live, than have a too brittle sound on playback (which is, after all, what the audience is REALLY hearing).
[This message has been edited by Diki (edited 09-12-2008).]
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An arranger is just a tool. What matters is what you build with it..!