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I'm interested in knowing more, but after a few minutes of searching, I can't seem to find a modern macOS implementation of the reference Fraunhofer codec. All my tools (Audition, xACT, ffmpeg, and even dbpoweramp) use various versions of LAME. Does Fraunhofer's encoder preserve above 20kHz at 320kbps?

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Apparently Music uses it...or at least it used to.

https://podcastengineeringschool.com/itunes-uses-fraunhofer/

iTunes' MP3 encoder is awful, so that's not a good sign.

It's iTunes' AAC encoder that's good.

Haven't encoded anything with iTunes/Music's mp3 encoder in years, ever since AAC came out.

What's amusing is that speakers may have been optimizing themselves for LAME, since it's pretty much the dominant encoder.

As an aside, the docs attached to the repo referenced above has the first good explanation of "joint stereo" I've ever seen. I remember seeing the "joint stereo" button on the first encoders, and nobody ever said what that actually did.

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