static extern Int32 mixerGetControlDetails(IntPtr hmxobj,

Declare Function mixerGetControlDetails Lib "winmm.dll" (<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Integer) As Integer

private static extern Int32 mixerGetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, uint fdwDetails);

public static Int32 mixerGetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, MIXER_OBJECTF fdwDetails, MIXER_GETCONTROLDETAILSF getControlDetails)

     return mixerGetControlDetails(hmxobj, ref pmxcd, flags);