@John Smith
Feedburner has a WordPress plug-in that converts all the default blog feeds into a single one oriented to the Feedburner one. The problem I finally determined was that the default one it looks for, in my case http://silenceandvoice.com/feed, changed in the current version of WordPress (an unusual thing to happen, as defaults do not normally change).

I decided to use Subscribe2 because I prefer to self and internally manage these function rather than send it out (to Feedburner / Google), as when their systems do not work well (as has been the case), then I have no recourse whatsoever.