There has never to my knowledge been an attempt to do what you have laid
before us here, but....
In classical organs the mixture does generate tones that like a resultant go
to re-enforce the other ranks.

Now I have seen one organist take an unit organ that has a UNIFLEX relay and
extend the rank up one octave. In simple terms he took a rank that ended at
the 2ft pitch and made a 1ft pitch stop that played the full manual compass.
He did this by not just repeating the top octave but started with C# playing
the note G# below and on up the remaining notes. At F# he jumped back to A#
below and when he ran out of pipes he went for the octave. This works like a
mixture that breaks in the octave and when it does break back the jump in
pitch is not an octave jump and in his explanation not as noticeable a
break..

Now there will be many who might poo this because it was on a unit organ and
the tuning isn't perfect but I don't think there was anyone in the audience
that noticed anything unusual.
Buddy Boyd
Piedmont Theatre Organ Soc
http://www.lostprovince.com/PTOS/
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