[sdiy] Number of tonewheels in a drawbar organ

[Donald Tillman]

On May 31, 2010, at 9:25 PM, Steve wrote:

> This gives a total of 109 tonewheels for a 5 octave keyboard.  Even more
> would be needed for two manuals and pedals.
> 
> I've checked my logic above with a program that just lists all the
> frequencies by looping through each of the drawbars for each of the
> notes.  
> So what am I missing?



"Foldback".  Some of the higher harmonic tones of the higher notes use frequencies an octave lower than proper.  It's part of the charm of the Hammond.

Details here:
   http://www.dairiki.org/HammondWiki/HarmonicFoldback

  -- Don


--
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com