DZ 125 & DZ 123 Digitrax decoders

[Bernard]

Is anyone else finding that the new Digitrax DZ 125 which replaced the DZ 123, have a different setting?
On my last 2 decoder installs which were both the DZ 125s, the trains are running faster at a lower setting, would this be because of the CV?

[CaptOblivious]

I know the '5 added BEMF, which when turned on can increase the speed of the locomotive—sometimes dramatically! (How or why I know not!). Is BEMF turned on by default? (look at CVs 55,56,57; a non-0 in each means it is on.)