Piotr Barcz asked for an idea to scan music rolls [200807 MMD].
To play my Hupfeld Violina with MIDI files I made a 'push-up player'
with solenoids.  But I could not find suitable music files, so I made
also a 'scanner' with an original spoolbox and some pneumatics.

I was successful.  I read the small bellows [motion] with light barriers
[photo interrupters].  An interface then produced the MIDI files.  As
you like: without errors from bridges, and so on.  The picture looks
like 'piano roll' view.

Walter Dahler
Switzerland
http://www.mechanischemusikinstrumente.ch/

 [   Push-Up
 [ https://www.mmdigest.com/Attachments/20/08/16/200816_151043_''Push-Up''.JPG 
 [   Scanner Front
 [ https://www.mmdigest.com/Attachments/20/08/16/200816_151043_Scanner%20Front.JPG 
 [   Scanner Reverse
 [ https://www.mmdigest.com/Attachments/20/08/16/200816_151043_Scanner%20Reverse.JPG 
 [   Detail
 [ https://www.mmdigest.com/Attachments/20/08/16/200816_151043_Detail.JPG