Apart from some significant contributions in the scientific community and a few notable product innovations, audio input for musical interaction purposes on mobile devices has until now been widely neglected as a control parameter. This situation does not correspond to the fact that musical ideas are often vocalized and developed by musicians using their voice or other sounding objects, nor does it take advantage of contemporary mobile devices' most rigid and reliable sensor - the microphone. As an example case exploiting these possibilities, we conceived a notepad application to track rhythmic ideas by recording taps on a surface with a smartphone's built-in microphone, refined by subsequent detection of onsets, clustering, instantaneous rearranging of the detected events, and export capabilities.
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