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Dear All, HAPPY 2018 !! With the new PCS organization in Opusmodus is possible to implement a concept of my book, called Combinatorial Voiceleading of Hexachords. From a Hexachord Set, is possible to find 10 different ways to combine the notes in the for of voice-leading sets. Each hexachord is divided in (3 + 3) way. This expression: (setf hexavl (mclist (chordize-list (integer-to-pitch (remove-duplicates (sort-asc (gen-divide 3 (flatten (permute (pcs '6-32))))) :test #'equal))))) Will result in this combination of the 6-32 hexachord, similar to the idea in the book. In the book, the material is organized in 70 pages of melodic and harmonic exercises. Here is a litte sample: CH_HERRLEIN.pdf The entire book: https://www.melbay.com/Products/Default.aspx?bookid=30042BCDEB Best ! Julio Herrlein