Try posting in rec.crafts.woodturning too.
Doug Miller (alphageek-at-milmac-dot-com)
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I don't know anything about them myself, but looking at the link
provided, it seems like they might have a lot in common with voicing a
pipe organ. If you can't find much information on tuning the call,
you might check that out as another source of general information. Of
course the reed will change things, but it may give you some
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