Yes, I've converted Recordo to Duo-Art.  It sounded better than I ex-
pected.  The piano was a Schultz Marionette, for a customer moving to
Florida who had a Steinway OR, which at 6'6" was too big, and a big col-
lection of rolls he liked.  I published the schematic about a decade
ago in the AMICA Bulletin.  I still have the schematic chart, and would
be happy to share it.

I did not change the tracker bar.  Basically, what I did was run
accomp. 1 and 2 as Recordo #1, accomp. 4 and 8 register as Recordo 4,
and any theme perforation (bass or treble) as Recordo 8.  Because the
Recordo is slow acting, this meant that the theme perforations just had
time to "goose it," so that melody and rhythm ride above what is play-
ing.  I tied the soft pedal (hammer rail lifts) together, but had to
change the sustaining pedal, because the Duo-Art sustaining pedal runs
much faster than the Recordo or Ampico sustaining pedal. 

Aeolian often used single/double perforations to raise the dampers just
as a note or chord was striking to remove the springs and shade the
note or chord slightly louder.  Also, many Duo-Art rolls are coded for
a swift on/off; so this needs to be done.  The tremendously good Duo-
Art arrangements did the rest.  The same system could be used to re-
tube a perforator so it would read Duo-Art rolls and punch out Recordo
rolls.

However, the Duo-Art's capabilities far outstrip those of the Recordo,
and that will always be the case.  Oh, yes, I installed a switch that
enables the owner to play either Duo-Art or Recordo rolls.

Bruce Grimes