I just had a play with your Mackie protocol, Mark, and, lo and behold, the zoom function works! However, the bank select function only works in reverse (you have to click back to go forward, and forward to go back), and, the LCD display only displays some of the channels and appears to be static (unchanging even when shifting channel banks). I need to be able to see the LCD display, of course, so the VS-700 protocol wins so far.