Lot’s of thinking along these sorts of lines… I’d like a second set of Midi sockets for instance.
You have mentioned the major issue in this sort of thing it’s not so difficult to add the hardware but adding it into the code base is more of an issue cos first off how does the poor old Zynth know it’s actually got an extra board on it without a whole extra degree of complexity in the webconf to explain the concept at the very least?
certainly there is an encoder board that jofo put together
So the concept isn’t alien but I think the overall conclusion was do it via USB rather than GPIO simply because it all looked much more flexible that way.