My greatest concern is - what steps will you take to guarantee the longevity of the program? I started using computer notation software in 1985. Of the many programs I purchased, most are no longer available or even usable as the companies went out of business or the programmers were "retired". The ones that do still exist are seemingly bloated with features in the need to appeal to a wide user base. I guess we all know the story about Sibelius, for example. I am sure some of us are willing to pay a higher price for a guaranteed lifetime of a program, but how do you plan to make that happen? Best wishes in your endeavor!