Thanks for the response. And yes of course we spend a lot of time and effort trying to get "Listeners" (I'm tempted to refer to them as "Learners") to contribute. 

We have it at the end of every single show. "Today's show was contributed by a HPR listener like yourself. If you ever thought of recording a podcast, click on our contribute link to find out how easy it really is."

Those who listen to this show, (meta reference for the Community News where this will be read out) will know how much time we spend asking people to send in shows.