After I started this thread and I got some reply’s from Bohan I tested the zipper noise issue more. IIRC one reason given was that some algorithms are ‘computationally large’ hence the grainy volume sweeps. I was sceptical but I tried and I found no basis for this reasoning. All of the algorithms I tried exhibited this lack of smooth volume control that I was looking for.
To sum it up:
1. The zipper noise is there and has been for a long time
2. It bothers some and is not an issue fir others
I suppose that Eventide May have needed more CPU time for something like smoother patch changes globally hence the decrease in expression pedal performance?
I still love my H9’s I maxed out @5!!
Peace
Al