I work with both player pianos and pipe organs, but I don't have
a lot of experience with player organs.  I have an interesting idea,
and since it is really hard to come up with an original idea in these
areas I pose this hypothesis to the group.

Is it possible to create vacuum if you have pressure, with no moving
parts?  What I am thinking of is a device that works like a water
injector for a steam engine boiler.  For those who are not familiar
with how this device works, steam is shot out of a nozzle and into
a funnel which is connected to the fill pipe on the boiler.  The area
around the nozzle and funnel is enclosed and has a water line which
is connected to this area and fills with water.  When the steam jets
across the opening from the nozzle and into the funnel, it sucks water
along with it to fill the boiler.

We treat air like water, so, can you make a device that is similar
except that the steam is replaced with pressurized air, and instead
of a water supply line you would have a vacuum line?

Ed Copeland
http://www.ourmusicalhouse.com/