not sure what's up with the voids higher up in frequencies. could be an actual thing or an artifact of using an iphone that saves to .m4a, which apparently can be either lossy or lossless and i don't fuckin know how to tell
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in reply to @bethposting's post:
m4a is usually a container for AAC iirc, and that spectrogram looks like lossy-compressed audio to me. and AAC is an Apple Thing so yea checks out