After a rather nasty middle ear infection, I am now "blessed" with diplacusis.
My left ear hears one semitone higher than my right ear (#C4 vs C4), so I perceive nearly every sound as two instances.
Dear God that is annoying as heck, especially when I try to play a musical instrument. Can only hope that this shit is temporary.
Kinda hilarious, we spend al this time learning about audio, agonizing over practically inaudible technical specs and optimizing our systems .... then from one moment to the next one of our sensors decides to crap out rendering all of it a moot point. At least I can set my RME to mono... never been this thankful for the "balance" setting.
Bottom line: it simply cannot be overstated how precious our hearing really is.