COM objects and instance creation in Lispworks

Hello all,
I am fairly new to Lispworks.
I am trying to grok the COM library.
In this case, I want to build an audio session monitoring for Windows, which to requires me to implement the IAudioSessionNotification in Lisp.

The interface is fairly simple



MIDL_INTERFACE("641DD20B-4D41-49CC-ABA3-174B9477BB08")
IAudioSessionNotification : publicIUnknown
{

public: virtualHRESULT STDMETHODCALLTYPE OnSessionCreated(/* [in] */IAudioSessionControl *NewSession) = 0;



};

To get access to use this event, I need to instantiate IMMDeviceEnumerator, from there we go get the GetDefaultEndpoint(eRender, eConsole, &device).
Then we do some more magic, the process is the same, and we end up with an IAudioSessionManager, with which we can register our callback class (IAudioSessionNotification).Do I need to replicate all the methods and types to be able to call the various methods on each COM class?


I started by creating a .idl file, that would mirror the IAudioSessionNotification and IAudioSessionControl. I assume I should continue creating all the types (IMMDeviceEnumerator, IMMDevice, IAudioSessionEnumerator, etc), should I also implement their interfaces (define-com-implementation).


All the best
David