monolake-style FM grains

Hi
I watched some demo videos by Robert Henke of his Max4Live granulator; he has some FM going on in parts of the video. Inspired, I attempted to add similar to my own granny-later, by simply modulating the grain-pitch value with a [cycle~ 50]. It is 'true' grain-pitch FM (without the carrier/modulator ratio) as I've implemented it, but it certainly sounds nothing like Monolake; it's just a bit samey. No matter what my source file, grain pitch etc I get the same timbres.

As I don't have Max4Live, can someone suggest what algorithm Henke is or might be using; for example is he 'self-modulating' the output grain stream? Or maybe using a richer modulator oscillator? Or relating the mod freq to the grain pitch (which I'm not)........forgive the rambling, but check out his video, the FM grain timbres are LUSCIOUS

Thanks
Brendan