I think most people have come to the conclusion that you do not want to
convert an Orchestrelle to play 88-note rolls.  I must also agree with
that, however, Craig Brougher comes closest to my thoughts.

If you must play 88-note rolls then tube into the system and build a
separate console to hold the 88-note spoolbox.  Because of the size of
hole in the roll you may have to build a primary valve box that may
also have to convert from suction to pressure.  You will probably have
to pressurize the spoolbox with a glass panel in front unless you have
one of the more rare suction Orchestrelles.

There is another option.  Call Larry Broadmoore, tel. 1-800-497-4266,
and see if he will build you a PowerRoll Midi to trackerbar converter
for the Orchestrelle trackerbar.  That should enable you to play any
of the CD-ROMs of scanned rolls that are now available.  I have two
Orchestrelles in storage waiting for restoration and that would be the
only way I would update the Orchestrelle software library.

DL Bullock
St. Louis
http://www.thePianoWorld.com/