Duaine - interesting question that leads to a lot of other areas to discuss. "pure" octaves actually have a bit of latitude. That is, depending on the piano, you can move one note of the octave around and have it still sound pure in the "whole tone" approach to tuning. Other pianos sit on the razor's edge between sounding ok and just bad. What's the difference? The matching of the specific partials between the two notes. Sometimes everything lines up pretty well and the octave has room to be expanded or contracted a bit. Other scales find the partials so divergent that the best you can do is to find the "least bad" sounding octave! While the ETDs allow for a "push button" approach to choosing octave width up and down the piano, the aural tuner chooses the octave width based on the chosen test intervals which highlight specific partial matches. Many times, the best choice is not to make any one partial match pure, but find a good compromise between all of the sounding partials. Room acoustics, brightness of the instruments and personal preference lead to different tuning choices from bottom to top of the piano. Ron Koval chicagoland _________________________________________________________________ Bing brings you maps, menus, and reviews organized in one place. http://www.bing.com/search?q=restaurants&form=MFESRP&publ=WLHMTAG&crea=TEXT_MFESRP_Local_MapsMenu_Resturants_1x1
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