My headphones don't work!

I am using MixVibes Pro Control 2 on a Windows 7 PC, on Cross DJ 3.2.0, and my headphones will not work at all! never used to have this problem before, all I hear through the headphones is buzzing
I don't know whether my settings are wrong but I have tried changing most settings and still no luck. If anyone can give me a rough idea of what the settings should be or if you know what is going on please let me know! Thankyou
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