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>
> Thinking about it... one technique frequently used in real organs is to 
> play several stops at once, each tuned to some octave of the fundamental. 
> (I.e., a power of two of the frequency.) If you assume the tone of each 
> pipe is approximately a pure sinewave, this is what you get.
>
Not only octaves but even 5th , or better said 13th (octave+5th)  with a 2' 
2/3 stop added to a 8'
When you press C1 key, it plays G2
That fakes the 3rd harmonic.
In French it is called "Nasard" because it gives sound a 'nose' colour.
In English 'Quinte flute'

Marc

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