The tutorial, seen on his Facebook page, is too good not to be shared on the forum. (I have been, and still am, soooo impressed)
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The input data is the pitch and duration of musical notes.
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They are put (via the split ({ }) by 'block' block; { } being the gray ring he dragged into the block, while blocks-as-data portion was excluded from the list by the "map ( { all but first of __ } ) over" so the input data remained only) into a new list created by the blockify (a right-mouse click option) applied to the result bubble.
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which is then used in a loop; and furthermore,
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all the musical notes pitch is (via the hyperized sum block inside the loop) raised, as if in a sound equalizer.
<small>Hope</small>
I hope Jens does not feel as if he is being stalked, at least not in a non-good way.