Request assistance binding to Windows dsound.{lib, dll}

[Andrew Edwards via Digitalmars-d-learn]

http://ftp.dlang.org/ctg/implib.html

The above URL suggests that, on Windoze, I can create a D 
compatible lib from a dll file by issuing the command:

     implib /s dsound.lib dsound.dll

The following file:

     sound.d
     =======
     pragma(lib, "dsound")
     struct IDirectSound{};
     alias LPDIRECTSOUND = IDirectSound*;
     extern(Windows) HRESULT
         DirectSoundCreate(LPGUID, LPDIRECTSOUND*, LPUNKNOWN);

     void main()
     {
         LPDIRECTSOUND directSound;
         DirectSoundCreate(null, &directSound, null);
     }

compiled as such:

     dmd sound dsound.lib

produces the output:

     OPTLINK (R) for Win32  Release 8.00.17
     Copyright (C) Digital Mars 1989-2013  All rights reserved.
     http://www.digitalmars.com/ctg/optlink.html
     sound.obj(sound)
      Error 42: Symbol Undefined _DirectSoundCreate at 12
     --- errorlevel 1

Obviously I'm doing something incorrectly but I'm unable to see 
it. Please shed some light.

The only thing I can see is that IDirectSound8 is improperly 
declared. It is struct generated form an interface which I have 
now idea of how to bind to from D:

https://gist.github.com/AndrewEdwards/560601a62ea890842ecac90bb41896a8#file-dsound-h-L214

Thanks,
Andrew