I've just made another (relatively) quick video tutorial about generating random drum fills in Reason.
Using the random setting for the RPG8 arpeggiator in order to randomly trigger a group of specific notes, one at time, out of a drum kit of your choice, and thus, genereating random fills.
A Random Matrix Curve Pattern is also used to control RPG8 velocity.
Usually a 1 BAR chord made by 1 kick, 2 snare and 3 toms works pretty well.
The idea is not new: I borrowed it from other videos made for ableton, so I thought to adapt it for Reason.
Hope you like it.
Cheers