Does this sound familiar to anyone else who knows more about this field of
expertise?
Yes. The symphony - more or less as you describe it, was a mediaeval version
of the hurdy-gurdy.
One of the best illustrations - of the big two-man version - is carvrd over
the doorway of Santiago de Compostela cathedral. No time to write more just
now - I'll post links and references later if anyone is interested, and
unless someone else puts it all up here first!
Philip
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