Don wrote and maintains Overture, currently on v.5.
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I don’t know if Encore 6 will handle part extraction/export the same or not but it will give you a point of reference. For now, SonicSores and PassportDesigns will be separate entities but Encore will gain some of Overture’s functionality (not VI handling yet). There is also talk of Overture being upgraded to open Encore 5 files. We’ll see. Anyway, you should check it out.