Carl Dodrill requested some information on the differences between the
176 note Aeolian player and the 116/58 note players.

The 176 note players automatically provide changes in registration as
required by perforations on the edges of the rolls.  The swell shades
are also operated by the edge perforations on the 176 note rolls.

Many of the 176 note players also included an adapter for playing the
narrower 116/58 note rolls.  It was mounted on the inside top of the
spoolbox and swung down when needed.  There were chucks at each end of
this apparatus which allowed the pin ends of the smaller roll to fit
into the wider 176 note roll configuration.  Leather flaps on this
device fit over the ends of the 176 note tracker bar to cut out the
automatic registration holes.

If I remember correctly, the Aeolian Corporation, when installing a
176 note player, would code the stop changes on the roll to match the
specifications of the instrument.  Therefore, rolls from one player
might not produce the same sound on a neighbor's player.

I know that Bob Taylor has been working on one of these instruments
for a number of years.  He may have some additional words of wisdom
to impart.

Best wishes,  Mike Walter