MPC 8 Swing is an essential patch that should have been included in Propellerhead Reason but which was not. So I created it.
You can use the Groove Patch in Reason’s Groove Mixer. It will make straight eighth notes (8 notes per bar) swing. You can control the amount of swing very precisely in a super easy way. The included manual explains it all.
Included in the ZIP are: .grov Reason patch and manual (PDF).