You can call Perfect Pass to confirm, but I think if you had a list of features and a column for the two versions being discussed, the 3-event would have a checkmark in every row (i.e. every feature) while the Wake version wouldn't. The 3-event has everything Wake has with some other features added. That means, if Wake version can do it, 3-event can do it.
The Wakeboard mode in my 3-event version allows speeds to be adjusted in about one-third increments for each mph, but I think I've only set the speed as low as around 10mph. In Trick mode you can adjust the speed by every tenth of a mph. I've used Trick mode for barefooting and set it to 40 mph, so I bet it goes down below 10 mph also.