Before buying: songs playing at a slower speed?

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I have worked in recording studios since i was 13 years old. I am an excelnt judge of quality (From what I have been told). I hear the 20 cents difference on my fuze on 3 songs. 2 of which are songs I wrote, the third is a song called Wagon Wheel by Old Crow Medicine Show. Thats it, From multilayer mixes on top of the line equiptment, to sings I took off of an old mix tape, everything else is fine. And The thing is no one I have asked can hear any variance in the 3 songs I hear it in. This is my challange. You give me the information about players that you think are better and I will test them. My boss is perfect pitch and “golden ear” (he can tell you if when a band on the radio recorded a song the lead singer drank booze or water just based on sound) and I will have him compare, and we will see what happens.