Using Reason 6's The Echo already? Rob at Reason101.net has some tips and tricks for you.
"Today let's take a nice little look into the world of The Echo. New to Reason 6, this is one of 3 new effects which were much anticipated by the User Community"
Trick #1: Echoing Slices in a Loop via Parallel Processing
Trick #2: Using a Matrix to Trigger Echoes
Trick #3: The Echo’s Feedback Loop
Trick #4: The Zipper Effect
Trick #5: Automating the Roll feature in The Echo with an LFO
Bonus Trick #6: Processing a Kong Snare Drum through The Echo