I noticed a lot of songs in my collection have this very strange line which is only visible when in the spectral view. The only way I've found which removes it is by applying a high-pass effect which cuts off anything below 5 hz. That fixes it!
You may ask: Why fix it? Well, it causes an audible pop sound when it reaches the end of the song and stops. It is very odd!
Very weird line under tracks
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This forum is for Audacity on Windows.Please state which version of Windows you are using,
and the exact three-section version number of Audacity from "Help menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
Re: Very weird line under tracks
Could it be "DC Offset"? https://manual.audacityteam.org/man/dc_offset.html
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
Re: Very weird line under tracks
Yes, that helped me pinpoint what causes it: I am normalizing tracks (so when I export to mp3 it doesn't distort) and it actually adds that to the track if I have it remove the DC offset as well, whereas if I normalize it without removing the offset it doesn't cause that issue!