These 3 parameters “H/T Glis, T/H Glis, Shape” only apply to when using the Flex footswitch. I think you are using an expression pedal, and so thats why you are not noticing a difference. If you set the Gliss times between .50 and 1 sec, you should notice it takes a longer amount of time to complete the Flex. Now, try changing the shape, and you should notice a difference between the rise/fall times. Let me know if that works.
