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mechanism can be obtained by solving the Navier-Stokes equation for an incompressible fluid in the vicinity of the jet outlet (Peter Hoekje, Univ. Northern Iowa). The results of Hoekje's model confirm that mode locking and octave overblowing occur in an instrument whose frequency response has near-harmonic resonances, but not in one whose second resonance is much higher than twice the first resonance frequency. "All well and good," responded Steven Wasser (Vern Q. Powell Flutes , Inc.), upon hearing these scientific papers, "but manufacturers of musical instruments are under constant pressure to improve productivity and enhance the performance qualities of their products. " It is the responsibility of the manufacturer to establish a dialogue between the subjective artistic requirements of the musician and relatively objective manufacturing factors such as material properties , dimensions and processes. To illustrate his point , Wasser brought along Jerado di Stefalo , a professional flautist , to demonstrate the sounds of flutes made from gold and silver.