Hello! Hey, I've recently purchased a Flashback Triple Delay. But I've noticed that, specifically with the Reverse Delay Type, there is no change whatsoever if I move around the Subdiv Knob; however it does work with all the other Delay Types and even the TonePrints. Do you know why this might happen? Is my unit defective? Or is it that Reverse Delay on all units don't work with the Subdiv Knob? Thanks in advance!