Richard, As I said before, I think (sometimes) that because I am basically self taught, nobody told me what not to listen for so maybe I am not crazy. Don't know what it is but imagine it to be the 4th and 8th harmonics beating with the 2nd and 4th harmonics of the octave above note. You were talking before about an ETD that you could use on two sets of partials at one time. Maybe that is what it is for. Regards Tony Caught ICPTG Australia caute@optusnet.com.au
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