Is there any particular reason you are using directsound directly, I am not really familiar with DirectX Audio but XAudio2 replaced DirectSound and to use the 3d functionality you use X3Daudio

http://msdn.microsof...8(v=vs.85).aspx

Of course this could be completely inaccurate since I am fairly new with SlimDX/DX, as for examples everything can easily be translated from DX to SlimDX and SlimDX supports both Xaudio2 and X3d, oh and the directx SDK has an example on how to integrate X3d with xaudio2, there is a sample too in the samples folder

edit: theres also examples of DirectSound in the SDK too but based on what I have read you may want to consider using Xaudio2 for the sake of things.

According to MS "For Windows game developers, XAudio2 is the long-awaited replacement for DirectSound. For Xbox 360 developers, it is an enhanced version of the previous XAudio API. It addresses several outstanding issues and feature requests."

Is there any particular reason you are using directsound directly, I am not really familiar with DirectX Audio but XAudio2 replaced DirectSound and to use the 3d functionality you use X3Daudio

http://msdn.microsoft.com/en-us/library/windows/desktop/ee415798(v=vs.85).aspx

Of course this could be completely inaccurate since I am fairly new with SlimDX/DX, as for examples everything can easily be translated from DX to SlimDX and SlimDX supports both Xaudio2 and X3d, oh and the directx SDK has an example on how to integrate X3d with xaudio2, there is a sample too in the samples folder.