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DirectX SDK Sample (3D Audio) gives me unresolved external when implementing?

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I'm not sure if this is the right forum for XAudio2 questions,it was in the DirectX SDK...so the problem is this:When I implement the XAudio2Sound3D sample from the June 2010 SDK.I pretty much copied it all in my own framework and this one variable([b]sound3DInstance[/b]) shows up as an unresolved external: X3DAudioCalculate([b]sound3DInstance[/b][i], &listener, &emitter, calcFlags, &dspSettings[/i]); and X3DAudioInitialize([i]details.OutputFormat.dwChannelMask, SPEEDOFSOUND, [/i][b]sound3DInstance[/b]);
Where the variable types are:
X3DAUDIO_HANDLE sound3DInstance;
Now the only common variable in both functions that show the error is [b]sound3DInstance[/b],so that has to be the problem.In the SDK Sample all the variables are put in a struct called AUDIO_STATE and in the initialization of the program,they call:
[CODE]ZeroMemory( &g_audioState, sizeof( AUDIO_STATE ) );[/CODE]
In my code the variables are members of my Sound class and I just ZeroMemory them one by one,so shouldn't the effect be the same?

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That's because you have to link to their corresponding libraries. Try this:

#pragma comment(lib, "x3daudio")
#pragma comment(lib, "xaudio2")

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