This is a sound "scanner" that allows the user to see the waveform/spectrogram of the particular time/sample in the sound being played. Yep, this is open source; you can look inside to see how it works and it has comments to make it easier for some.
(Every project is open source, because of the share in the motto and the see inside button :D ) Made it use Scratch's "doubled" waveforms, hence Scratch being in the title. Uses Scratch's music called "dance snare beat."