![]() On the pianissimo side, the instrument may lapse into producing an essentially pure tone based on the tallest resonance peak, and on the loud-playing side the reed may simply choke up and snap closed if too many generated components lie at dips in the resonance curve. The player must make rather subtle adjustments of his embouchure and blowing pressure in playing multiphonics. The chief reason for the difficulty lies in the profusion of heterodyne components found in the inter-peak regions of the resonance curve. Because neither the components nor the peaks need be in harmonic relationship, oscillation is not as easily maintained for multiphonics as it is for normal tones. ![]() ![]() A multiphonic oscillation is maintained by cooperations set up between several of the components and several of the taller peaks in the air-column resonance curve. The ordinary tones of woodwinds also fit this description, but the frequency components in normal tones are limited to those belonging to a single harmonic series. ![]() Benade A multiphonic oscillation is made up of a collection of components whose frequencies are connected to one another by an elaborate set of heterodyne (mixed frequency) relationships.
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