Not sure I understand correctly what you're trying to achieve but what about using directly a line and shade it ? Problem with this method however is you have to calculate/scale the line width.
Joining some idea comps.

Hi @mmengelhardt and welcome ;)

Great start!

• For the width of a string, with this version of Vuo it's probably better to calculate the amount of characters in each string like you started yes. The next version of Vuo should allow text layers to scale and their sizes will probably be easier to measure.

• So calculating the amount of characters and the next step is to sort the list, I tried using the dictionary built-in nodes but I'm getting a bug (joining the composition for the team, no output from the dictionary) but using Martinus Magneson's amazing custom list nodes, it's pretty easy !
  So you need to install these nodes in order to use the composition I'm sending you, so for that :

  • go to Node Set: Magneson's List Tools and download the 4th version of his nodes (V.4 With cutting edge list cutting)
  • open Vuo and with a composition open and in the menu bar go to "Tools" and click "open user modules folder" and drop Magneson's downloaded node in that folder
  • relaunch Vuo

Now you can open the joined composition and give it a try.

• For the A or B sentence you can use a "Get Latest" node like I did in the Magneson nodes composition. I just used Keypad 1 and 2 instead of F1 or F2.

• This is to get you started, I have also dropped some nodes to get you started to also play audio files in a different order (I haven't tested that part might need some more work but you get an idea).