John,  I recently came across the web site of Majestic Piano:

    http://www.majesticpiano.com/

They have someone on their staff who is an "IICRC Certified Odor
Control Technician" -- whatever that means.  On the site, they talk
about smoke-damaged pianos as well as getting rid of odors from mice
and termite infestations.  Funny, I've seen termite infestations but
never noticed a smell.

Perhaps you want to contact them, or at least take a look at their
site.

Bob Fitterman
bobf@ilx.com