Patent 7206419 was granted and assigned to Industrial Research Limited on April, 2007 by the United States Patent and Trademark Office.
A musical instrument preamplifier system is provided which comprises a filtering means for splitting an input signal into two or more separate frequency bands comprising a similar phase response for each frequency band, two or more non-linear circuits, each of which distorts the input signal component of one of the frequency bands, and a summing network for recombining said frequency bands.