One statement by Jonathan Holmes in yesterday's MMD about the book
punching machine that he bought mystified me, the one where he said,
"Although it had a new set of punches for keyed music, it unfortunately
did not have a circular punch and die for keyless music."
Admittedly I am a novice when it comes to book music; so I would
appreciate some explanation here. I understand that a keyed roll frame
needs square-punched holes (square with respect to the hole ends). But
I thought that a keyless roll frame, being operated pneumatically, not
mechanically, wouldn't care whether the hole punches were round or
square.
What am I missing here?
Matthew Caulfield
Irondequoit, New York
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