In several application contexts inmultimedia field (educational, extreme gaming), the interaction with the user requests that system\nis able to render music in expressive way. The expressiveness is the added value of a performance and is part of the reason that\nmusic is interesting to listen. Understanding and modeling expressive content communication is important for many engineering\napplications in information technology (e.g.,Music Information Retrieval, as well as several applications in the affective computing\nfield). In this paper, we present an original approach to modify the expressive content of a performance in a gradual way, applying\na smooth morphing among performances with different expressive content in order to adapt the audio expressive character to\nthe user�s desires. The system won the final stage of Rencon 2011. This performance RENdering CONtest is a research project that\norganizes contests for computer systems generating expressive musical performances.
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