Maybe slightly off topic but I would be curious to know what the artifact of lower bit rate mp3 encoding is actually doing. It’s not aliasing, but it’s in the 6-15khz range. I could only describe the sound of the artifacts as a flock of seagulls in the distance flying towards you.

Edit: found this which answers a lot of this.

https://www.soundonsound.com/techniques/what-data-compressio...