Here's one more tip...

Get comfortable with your Sostenuto pedal... (You know, the middle one on the piano's three pedals)

On a piano, the effect is often subtle, but used on an electronic instrument, with sustaining sounds, it is quite radical. Basically, what it does is sustain ONLY the notes that you are holding down when you press the pedal. Hold the pedal down, but now play more notes, and they don't get held.

This allows you to do all KINDS of tricks that are typical of orchestras, but hard to do on a keyboard. High 'floaters', where a string note is held on the high strings, while all kinds of moving stuff gets played underneath it, or pedal tones, where a bass note is held, and then a bunch of busy stuff is played on top of it. Also, sostenuto, THEN a change of registration allows you to play. say a nice open string voicing, hold it with the sostenuto, change to another registration, and play say a brass/winds split over it.

If your arranger has TWO footpedal inputs, you'll often find that sostenuto is one of the options for the second pedal. Use it... it is a blast!