I know that this is maybe more a labor of love than a product, but don't you feel just a little bit redundant, walking (slowly!) where others have already gone?
Couple of full featured software arrangers already out there. Other than simply duplicating what already exists, do you have any ideas for a software arranger that no-one has yet implemented?
If not, what's the point?
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An arranger is just a tool. What matters is what you build with it..!