I have been restoring an upright pedal Half Duo-Art.  I think I have
a fairly good understanding of the Duo-Art part but this piano is also
marked as a "Themodist".  Was this just the name of the Half Duo-Art
or is this an additional nightmare?  It's tied in with the expression
system so I am assuming that's all this is, since Aeolian wouldn't have
wanted to call anything a "half" of something.

Joseph Musser