This instrument is free. No attribution required, unless the samples are spread/used unmodified.

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Graphics & programming: Alexandra van den Heetkamp (http://www.flaneurette.nl)

Sound Shapes
Artist/Composer: Alexandra van den Heetkamp (http://www.flaneurette.nl)

Sound Instruments
Artist/Composer: University of Iowa.

Sound FX (Licensed under CC attribution if left unmodified)
Artist/Composer: William Dyer
Artist/Composer: Alexandra van den Heetkamp (http://www.flaneurette.nl)