iamdave Hi Dave i believe once you create a Lyrics only song file you can not add audio to it, what you need to do is create an audio file , either stereo or multitrack, then go to your lyrics only file and copy and paste your lyrics data.This applies the same in reverse if you have audio files that have lyrics.
The only advantage i can see of why you would want a lyrics only file is if you want to have lyrics time coded but you don't have audio , or you haven't got the audio file yet but want to save your Lyrics somewhere you can easily find them to copy and paste to your audio file once you eventually get it.
I normally have all my lyrics in Notepad in a folder so thats where all my lyrics are as a backup, totally seperate to the ST3 folder and the hard to get to lyrics, the ST3 lacks a folder called Lyrics where you can just get to that folder like multitrack and be presented with all you text.
For that reason i use Notepad to store lyrics cause i can get them relatively fast and copy , edit or whatever i choose to do with them than i just paste them to ST3 where ever they are needed.
Perhaps one day we will have a very easy ST3 folder to manipulate all our data , including multitrack where a multitrack folder contains song folders with all the multitrack data for individual songs contained in this one folder for easy transfer from computer to ST3 folder, but thats off the topic, i tend to get carried away with how i think things should work because my no 1 priority is making life fast and easy for musicians so they can just concentrate on their music not a complicated computer operating system.