You ask for my old sins and want to listen to my examples for bad mixing? Really?
Here we go
I searched for my original "Black Metal" cassette demo tapes I talked about, but only could find songs that are already copied to a demo CD. This songs had been kind of a transition between recording only with cassette players and trying to add fx and kind of "mix" within a thing called DAW.
Here is a "better" track from this time (late 1990s). I still like the part in the middle:
This song is even older and has still very bad casio keyboard drums. Guitars had been recorded on cassette and later copied into Magix Music Maker (I think).
But hey, because it is (sometimes pretty happy sounding) "Black Metal" I can always say, the ugly sound and bad mix was INTENDED