Scroll down to “crg_Text_from_File.jsx”. It has the option of putting each line of text on it’s own layer, or all text lines on one layer. Very Nice. Oh, yes it needs a text file (.txt) to work.
It does sound like you’re using two different layers, one a text layer and one another layer with write-on applied. Are you trying to reveal the text, like Jayse reveals vines with Write-on in his tut, here?
After rereading that you’re revealing a psd with Edwardian script, I think Jayse will help. In the third part, Animation, he uses Write-on to reveal vines, it might help:
Basically you draw a mask over the text, Copy the Mask Shape, then Paste that into the brush position, and change the Paint Style to Reveal Original Image. See the tut for details.