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First provide a summary of the paper, and then address the following criteria: Quality, clarity, originality and significance. Quality and originality: The main claims of the authors make intuitive sense. Specifically, figure 1 presents a generative model which separates note onsets from activation and spectral information. This is in keeping with the physics of a piano, where a pianist initiates a note onset by sending the hammer in free-flight. Those harmonics change over time based both on decay and on the piano's physical dampers.