Jon Catler's description of undertones

Paul Erlich wrote:
>Jon Catler, quoted by Johnny Reinhard, wrote

>> "The difference between the frequencies of the
>> two notes being sounded produces a third note
>> below the range of the first two, called a difference
>> tone. By playing through a _descending_ harmonic
>> series with two notes and keeping a "B" on top, we
>> can see that the difference tone line creates an
>> _ascending_ minor scale that corresponds exactly to the
>> Undertone Series created earlier from mirror-imaging.

> The wording here is unclear -- anyone know what Jon
> meant by "playing through a _descending_ harmonic series
> with two notes and keeping a "B" on top"? Judging from
> the results, he probably meant something like "playing
> through a series of superparticular ratios, with the upper
> note fixed at "B", and the lower note descending."

This is exactly what he meant. I believe this passage
refers to the part we just heard last night in "Sleeping
Beauty" where Jon does this on his JI electric guitar.

Joseph L. Monzo
monz@juno.com


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