> The bridge balance pot may not be so lucky, though.  I don't think it needs 
> to be anything very special.

As far as I can tell it is a very special pot wired with two resistance tracks. 
 The coarse track has with two wipers connecting to the fine track which has 
just one wiper, all driven by a clever mechanism to provide both coarse and 
fine adjustments with only one shaft.

In line art like this:

----
   x
   x
   x<-----
   x      x
   x      x<---
   x      x
   x<-----
   x
   x
----

Dave

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