Yeah that's very good thanks !
Unfortunately, I don't think it would be possible to make the grains overlap. At least not with one r-machine !
But with multiple machines the difficulty would be to control them.
I was looking for a vst doing that, and I found this :
http://newsonicarts.com/granite_overview.htmlI think it's really good and consider buying it. However I would love to see my MD doing the same ! (this is close !)