A new class of digital effects for musical instruments is proposed, which uses non-linear difference equations to process the input signal. Several different non-linear filter structures have been realized, and their properties examined. The -sound- of each device has been subjectively evaluated for non-sinusoidal input signals from various sources including musical instruments. The stability and controllability of the effects have been studied, and useful ranges of control parameters obtained.
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https://aes2.org/publications/elibrary-page/?id=5662
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