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I am the owner of an Aeolian upright player piano, style 551 p.
The tracking device is currently working, however it is not "tubed up"
as it was originally.  My player piano technician does not understand
exactly how it works; he believes it may be a Themodist Metrostyle
model.  Perhaps someone out there can help shed some light on this
situation.

The valve box has three primary valves and two secondary valves.  
Five tubes come up from underneath.  The tracking pneumatic has two
holes, rather than the usual three.  On my tracker bar there are two
long, narrow bass and treble theme holes, same as a Duo-Art, but it is
not a Duo-Art tracker bar with its 8 theme and accompaniment holes
above the rest.

This is the information given to me by my player technician.  Any help
would be appreciated

Arlene F Smart