Pitch change on playing a .wav file

[Terles]

So, I uploaded a .wav backing track file to play along with.  Problem is, it's off about 1/2 pitch!  When I play the same file on my PC, it's bang on pitch.  When I play on my guitar through JK, the pitch is bang on.  It's only when I play the file through JK that it's off.  Anyone else have this happen, or can think of other things to try or why it might be happening?

>>>
Likely a sample rate discrepancy. (#.wav = 44.1kHz at 16bit)

That was it!  Thanks Dimitri, never thought of that.  Took me a while to figure out how to reconfigure Audacity to get the correct sample rate, but once you pointed it out, I got it resaved as a .wav at 48000 & works like a charm.  Thanks again!