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+This is a home-grown visualization, with a couple lines of code copied
+from synaesthesia. It draws the waveform in the bitmap, then fades out
+the entire bitmap so older waveforms disappear. It looks OK, but it's
+grayscale so far (haven't solved the cmap problems, note all the commented
+out code). I'm going to try to make a much better version as time goes
+on.