Greetings,  For checking the Duo-Art, the "American in Paris" set of
rolls is a good test.  If the fast repeats work in the soft sections,
it is a good indicator.  Of course this can be faked by having the base
playing level set to high.  What you need to do is to even all note
playing and then set the base level as low as possible without skipping
notes.

A properly restored Duo-Art should play almost as softly as a Welte.
The idea that Duo-Arts play loud, louder and loudest is only true for
bad restorations.  Once you do this and have everything else rebuilt
and adjusted correctly, most rolls will play well.

There are a few rolls that should not play properly unless you make
compensations that will compromise subtle playing of other rolls.  The
Moszkowski Spanish Dance No. 12, played by Madriguera, is probably a
good roll to not expect to repeat in a couple of places.  I'm not sure
if this is the right piece, just going on memory.  The point is that
not every piece will be perfect especially if playing from a
mistracking roll.

As in all reproducing pianos, once you get the valves perfect and have
no leaks whatsoever between the valves and pneumatics, and if all
frictional aspects are the same, note-to-note (no hinge binding or
tight bushings), and once you get the regulators working as per factory
setup (you may have to deal with substitutions over the course of the
instrument's life as well as deterioration of such things as
overstressed springs), then the thing should knock your brain for
a loop.

It's a good idea to have it playing a restored piano with new hammers,
strings and everything else in good order.  How they got so much music
in so little resolution is amazing.

Best regards,
Spencer Chase
Laytonville, Calif.
http://www.spencerserolls.com/