Yep, leave it to Edge to produce a product with no manual...
So the zoom doesn't do anything? The reason I keep bringing it up is because the speed basically changes the scale of the X axis so I would expect the alternative (zoom) would change the scale of the Y axis. Don't jump off into complex features without learning the basics first.
If I had known they were going to actually get around to the datalog feature I would have bought a CS. Unfortunately I've never even seen one in person.
For now, just keep playing with settings to figure out what each one changes. If you look in my sig I think I was 17 when I wrote the Gryphon datalog manual and had almost zero experience with trucks, programmers, etc. I had only owned my programmer for a month or two and am by no means "smarter than average"