I opened up my EH POG the other day to take a look inside and noticed that there is a lot of unused real estate on the board, including tracks for a couple of additional pots and some more squares for offboard hookups, including one tantalizingly labeled "CV". One wonders if the HOG uses the same board.
I'll grant that it is unlikely that I have the soldering skills necessary to attach the necessary components to that portion of the board, but I'm curious nevertheless. Can one get this extra stuff working? Is there a difference in e.g. ROM that would make this impractical to do?