[StructLayout(LayoutKind.Explicit, CharSet = CharSet.Auto)]
struct MIXERCONTROL
{
   [FieldOffset(0)]    public UInt32        cbStruct;
   [FieldOffset(4)]    public UInt32        dwControlID;
   [FieldOffset(8)]    public UInt32        dwControlType;
   [FieldOffset(12)]    public UInt32        fdwControl;
   [FieldOffset(16)]    public UInt32        cMultipleItems;
   [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MIXER_SHORT_NAME_CHARS)]
   [FieldOffset(20)]    public string        szShortName;
   [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MIXER_LONG_NAME_CHARS)]
   [FieldOffset(20 + MIXER_SHORT_NAME_CHARS)]
   public string        szName;

   // Union "Bounds" start
   [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS)]
   public UnionBoundsSigned ubs;
   [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS)]
   public UnionBoundsUnsigned ubus;   //insatnce of UnionBoundsSigned struct
   /*            [MarshalAs(UnmanagedType.ByValArray, SizeConst=6)]
                [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS)]
                                public UInt32[]  dwReserved1;*/
   // Union "Bounds" end

   // Union "Metrics" start
   // additonal 6 DWORDs
   [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS + 24)]
   public UInt32    cSteps;
   [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS + 24)]
   public UInt32    cbCustomData;
   /*            [MarshalAs(UnmanagedType.ByValArray, SizeConst=6)]
                [FieldOffset(20 + MIXER_SHORT_NAME_CHARS + MIXER_LONG_NAME_CHARS + 24)]
                                public UInt32[]    dwReserved2;*/
   // Union "Metrics" end
}