Hidden volume equalizers, whether in the OS, the audio player or the music. Also those players that skip the first second of music

This is probably my only gripe with digital music, it can be fucked up and you'll have no clue as to what layer is responsible for it not sounding "as it really should". Hell, you won't even know what it actually should sound like!

And players that skip the first bit of the music, as if every music began with 1 second of nothing. Learn to code so it only plays AFTER it's fully done loading, ffs