ok, thanks !
(I believed the grind blast was the suffo blast at very high speed, with half cymbal-hitting, like this :
Code:
x---x---x---x---x---x---x---x---
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
that's why I asked. thanks again !)