M Ted I am sorry that for historical reasons, my programs are written in a language (originally in QuickBasic for DOS, now Visual Basic) which is not supported on the MAC.

To port them would require a massive rewriting effort, as well as learning a new language and operating system. In view of the HUGE number of registrations received on Windows systems (2, at the last count, for the latest version of HARMONY, after at least 800 downloads), it doesn't appear that there is much point.