GuitarLink Beeping Sound when connecting this to my Macbook Pro

I've just bought GuitarLink and I'm getting a beeping sound through the speakers in my Macbook Pro whether I hook or external speakers or the onboard speakers. I've been able to determine that the problem is with the cable by shutting off both Garage Band and Guitar Rig 4 LE and still being able to detect the signal no matter the combination/configuration of software. Any suggestions?
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