The only way I know of to convert a Themodist to a full Duo-Art would
be to find the Duo-Art parts.  You would need the expression box and
valves.  The next step would be to find a competent technician to
install it in your piano.

I have not looked at a 65/88-note player but would wonder if the
expression holes for the Duo-Art would be there and my guess is "no"
they would not exist on the 65/88-note tracker bar.  Then you would
also need the correct tracker bar.

It might be possible for a machinist to add these holes to your tracker
bar but I think the 65-note holes would be in the way.  If the 65-note
holes where on the bottom of the bar below the 88-note holes then it
could be done.

Don Teach, Shreveport Music Co
1610 E. Bert Kouns, Shreveport,  LA  71105