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
What am I missing here?
Irondequoit, New York