In answer of the question about a music roll editing program for
Macintosh (and also PC),  I am happy to send the following
information.

Here is the web address of the presentation of a program I helped to
write, especially for the printing of carton or paper rolls, for any
type of mechanical music instrument: http://www.myriad-online.com/

It is possible to download the latest version of this shareware program
(named Harmony Assistant).

Thank you for the regular sending of the mailing list.

Jean Potteck