I have a 24-key music roll for the 20-key Jeager & Brommer
Drehorgel tuned in B-flat (A#), with this scale:

F,Bb,C,D,Eb,E,F,G,A,Bb,C,D,Eb,E,F,G,A,Bb,C,D,swell?,x,x,x

The paper is 11 cm wide (4.33 inch).  I measured 18 holes
in 7.0 cm (2.755 inch), or 0.153 inch per hole.

Is this note-scale and roll format the same in other makes
of small organs?  Is the music interchangable?

Robbie Rhodes