But the 500hz tone is easily identified, sounds like a sine wave, and the pitch is spot on, as verified by tunelab (thanks, Bob!) on my Pocket PC. > > Ric does come up with some fun questions, doesn't he? > > Don Mannino Thanks Don, but damnet, can't I get two stand alone supersonic audio generators? >From the computer, or from Tunelab? I love Tunelab, with its audio output and frequency readout. Does it go supersonic?? On another tack, how do they make supersonic dog whistles? Is it that hard to get two that are 300 or 400 or 600 apart and blow them together and listen for audible resultants??? That would prove it once and for all, above all the mumbo~jumbo theoretical-if-ands-or-butts; or perhaps sirens as described in Helmholtz. ---ricrm
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