While this project is fully functional, the dependencies are no longer up to date. You are still welcome to explore, learn, and use the code provided here.
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Waveform.JS makes drawing SoundCloud waveforms simple and lets you style and color them the way you want. It comes as a small JavaScript library and is using a lightweight service hosted on waveformjs.org that translates the waveform image provided by SoundCloud into an array of floating points.
Head to waveformjs.org for the documentation.