Wow, that sounds tricky.
Not sitting in front of AE ring tnow, but what I would do create one layer of text “Chicago 11:00 AM ON TIME” using the digital readout font. Use the character offset to randamize the letters(key frame) and at +1 second 0 offset(keyframe).
Then I would use the character range, and keyframe the offset from 0 to 100. So that the letters come in 1 at a time, left to right.
Now duplicate the layer, and a mask to the top half of the characters. Copy mask and paste it to the bottom layer and set to invert. ON the top layer, change the character offset by about 20. Now you have two layers, where the top and bottom aren’t changing exactly the same.
Precomp and apply a cardwipe transition and play to taste.
Johnny Cuevas, Editor
http://www.ckandco.net