The boggest polyphony "offender" has got to be the sustain pedal. If you hold down 5 fingers, while playing a patch that uses 3 tones made up of 3 parts each - that's 9 notes per finger ! ! (45 notes total!)keep the pedal down, and move the chord ONE time and you're OVER already!!!!
Thin out some of the tones when you layer sounds. Take out some of the attack portions of the pianos, cuz they will probably be covered up by the layer anyway. Get rid of londm sustained tails on synth patches too - they never seem to go away fully. Remember this ONE rule: The more tones you layer, the closer you get to that "Farfisa" organ tone. It's true!
K>I>S>S> ( remember? Keep It Simple Stu*** )

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Uncle Dave