Hello All -- After reading Mr. Simons response I felt to I should
interject a little history here.  There was a lot about this in past
MMD articles after this was done.

I was the person that brought this instrument back to life for
Disneyland.  It had been playing a nickelodeon "G" roll for most of
its life, and not its original 75-key music, because in a commercial
installation like Disneyland they needed a coin trip and a multi-tune
roll; Welte music is usually one tune per roll.  The instrument had
been put into storage because they could not keep it running correctly.

When Disneyland was planning a remodel of the Main Street complex they
consulted me on what to do for a period music machine, and I suggested
the return of the Welte Concert Orchestrion that had been in the Main
Street Penny Arcade since the park had opened.  They said this would
not be possible because of its many problems.

When I learned what the operational needs were I suggested a conversion
to a MIDI control system which would allow the orchestrion to play its
original 75-key music for the first time in 44 years.  It would also
eliminate the problems with the vacuum system and would allow it to play
a wide range of "correct" tunes.  I provided them with an audio CD of
what their instrument really sounded like and they were amazed that it
was the same machine; after hearing it play a "G" roll, you can
understand this!

With the assistance of my team -- Dave Allen, Disney's project manger
and former "Piano Man" of the Arcade Department who had restored the
Welte in 1972, and MIDI expert Mike Ames of Solana Instruments --
I set about the task of bringing the Welte back to life.  My main
concern was there be no modification to the instrument.  This was done
by adding a simple magnet stack in line with the pneumatics which can
be completely removed by just two screws.

I did not want the pumps to be damaged by running daily so a remote
German-made organ blower was added to the project; this is fed into
the organs reservoir by ducting coming through a bottom plate in the
original pumps.  Yes, _no_ holes were cut.

There was a considerable amount of pipework damage that had to be
restored, including all the brasswork.  The case also had some
damage from age that was restored, and then the entire instrument was
refinished.  The interior was cleaned thoroughly and other systems were
restored as needed for its operation.  Our own Robbie Rhodes even came
by to see this orchestrion when it was at my shop in Chino as he lives
not too far away.

So in conclusion here, this Welte now plays its correct music in its
same location at Disneyland since 1955.  It plays daily, via a remote
timing system and a kiosk so that thousands of guests can see and hear
this historic instrument and be exposed to the wonders of mechanical
music.  There are a few other machines in the Park I service: the
Nelson-Wiggins in the Main Street Train Station is a great machine.
If anyone has any questions, I welcome all to ask.

For your information, this is a Welte Style 4 Concert Orchestrion;
Cottage Orchestrions were models 0 through 3, and Concert Orchestrions
were models 4 through 10.

Thomas Grace, Organbuilder/Restorer
Chino, California