P.S.: Not really your question, but I couldn’t resist to suggest this option.
You copy and paste the text lines into a MoText, which moves up one “line” in P.Y for each change. With an Plain Effector set to Scale -1 and a falloff to Box/Invert, you have always only one line visible.
Have a look into the file. Once the “mechanic” is set up, you can easily delete and replace the text with a new one. The file is set up in “sketch precision”. I would set up ten lines with a specific font, to get the hight, and dived that by ten to get the P.Y—it’s easier to measure that way.
(In the attached scene […MGtl_01.c4d] I just pulled the Y value, hence the “sketch” comment. I measured with a cube the over all distance of the lines. Lets say it was 1080 units with the selected font and 88 units height (Text) for ten lines. I created ten key frames and selected all of them in the F-curve manager. To get the lines switching up, via step interpolation I set all to step, as all where selected, on change, done. In the Key Value I typed in “num/9*1080”. In the Key Time I typed in “num*12” if I liked to have each 12 frames a switch. Done. :o) […ANst_01.c4d] https://www.amazon.com/clouddrive/share/sxWM6VyZJm8wVwRhSbH4yVCMicWU9Ke0ShAHSk3YcfU