>>The question is, are there AUDIBLE resultants, which is a sound >>we CAN HEAR, that is produced from two frequencies we can't hear >>such as 20,440 - 20,000 hz which gives on paper 440 hz or A440 >>which certainly we can hear. I've done this experiment using Soundforge to generate two sinewaves (20k and 20,440hz)-and then mixed them in a CoolEdit multitrack session. Apart from noise which I guess is due to my cheap soundcard, 440hz is clearly audible in the resultant waveform. I can post this (as a small .wav or mp3) to the list if anyone is interested.... Mick Danby "...It is the reasonless soul, not the will or wisdom, that is beguiled by music - a form of sorcery which raises no question, whose enchantment indeed is welcomed..." -Plotinus
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