Is there a list of library items to store ..

Thanks, there are also symbols for the file types to see in the online manual ?
Its about organizing.
 

If this layout in the 2 libraries is installed by default in Synfire then a user is also helped.
In the beginning it was just the parameter and phrase , but so much has been added

You could, of course, include a fixed folder template in Synfire's two libraries that could store all the information produced. 
The information could be dragged there when generating this.
Probably that drag and drop information also falls into/between the fixed folder template( suppose it exists) , as I have already seen.
Matter now of drag and drop to the appropriate folder....