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Topic: limiting harmonic overtones in the lower pitches

On a real piano, the higher pitches sound "cleaner" (brighter?) at least in part because we simply cannot hear as many of the overtones in the harmonic series of the string.  Is there a way to have the overtones die out sooner with Pianoteq?  I imagine something like applying an exponential decay curve to the set of overtones, so that maybe only 5 overtones are audible for any pitch.