Before buying: songs playing at a slower speed?

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Im gonna take my fuze to work tomorrow, and use a pure mp3 file (never seen a computer other than  the one it was created on) in the studio and run it thru the crystal tuner, Then Ill use the same file on my fuze and run that thru the studio and the tuner. If my assumptions are correct I will get a difference so low most people wont be able to hear it. People like the arranger and myself and anybody who has a trained ear may hear it but those are unique cases. Like Ive said before I can only hear a difference on my own songs (placed on the fuze as mp3).