Mike,  Many thanks for your explanation of both the 116- and 176-note
Aeolian rolls and spool boxes; appreciated.  Helps to give us a better
understanding.

By chance do you have one of the 116-note instruments?  If you do,
a pencil rubbing of the tracker bar would be appreciated.  The reason
for this is to measure the distance between the two rows of ports on
the bar, a dimension not shown on the MMD drawing.  We may be able to
determine this from the one roll that has come to our attention, as
we note many neighboring perforations staggered about a 1/4".

We are trying to develop an emulator to translate this type of 116-note
roll into a MIDI file.  In the end, we may just do a simple conversion
into an e-roll [MIDI file], rather than a MIDI Type 1 file.

Much as we would like to be able to scan 176-note rolls, our scanners
are still bound by an A3 type CIS sensor, limiting us to rolls not
wider than 11-1/4".  So far, we have not found a source for a CIS
sensor wide enough to accommodate these wide rolls.  I suppose it's
always possible to build a twin array scanner using a pair of A3
sensors, but then we get into some pretty sophisticated construction
and programming.  So, for now, we will concentrate on the 116-note
rolls when they can be found.

Regards,

Terry Smythe
Winnipeg, Manitoba, Canada
http://members.shaw.ca/smythe/rebirth.htm

 [ See  http://mmd.foxtail.com/Tech/Scales/index.html  and
 [ image  http://mmd.foxtail.com/Tech/Scales/aeo116a.gif
 [ Under the title is "Each hole is 0.085 inch wide x 0.058
 [ inch high.  Vertical separation 0.25 inch center-to-center."
 [ -- Robbie