John Page said in the 07.08.11 MMD:

    Bill Chapman pointed out problems caused by "drawing" from one pipe
    to another.  To elaborate, if two pipes near each other are pitched
    sufficiently close to each other, the playing of one of them could
    be influenced by the other.

Well I'll be.  So, when you're trying to tune one pipe, pushing air
through it and it alone, you hear a certain amount of signal from any
pipe that's close in both frequency and proximity?  Sounds a lot like
piano strings, but I wouldn't expect it to happen with organ pipes.  I
guess this would affect the sound of the organ, too, sort of like
having a piano with no dampers.

  [My editing may have caused some confusion here.  I believe John is
  [referring to a situation where wind is being supplied to all the
  [pipes in question, not just to one pipe.  John?
  [--Relief Editor

This is the reason I like to lurk on this list.  My collection of
mechanical musical instruments matches my skill with them: both zero.
But this is fascinating.  Thank you.

Mark Kinsler