Apple - Lightweight Audio Waveform Viewer

It's not a Quick Look plugin, but Sound Studio it is fairly lightweight, and displays the waveform:

However, I'm afraid I don't think you'll find the waveform itself to be particularly useful for determining duplicate songs.

Try Audacity. It doesn't seem to heavyweight for just waveform viewing.

I have tried two options:

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https://github.com/seagirl/QLWaveForm/releases/tag/v1.0 << that worked

https://github.com/ideoforms/qlspectrogram << Doesn't work on catalina

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