Darrell,
I recall a sales/promotional campaign that included a video presentation and some jingles and pre-produced commercials, that we used to introduce advertisers to our medium back in the mid- to late-70's. I believe it was called "Get It on Radio...and Get It On!" This campaign featured not Orson Wells, but another hugely talented "big voice" actor, Paul Frees, who did character voices for Disney animations and a slew of commercial V/O work for Radio and TV.
A diligent Google search might yield something from this campaign. I didn't see anything in the first 4 pages I just called up, but maybe you'll have better success.
There's a chance I saved a cassette tape with some of the stuff we produced back in Winona, MN to promote our ad sales department. If I can find it, I'll post it for you.
Meanwhile, here are a few classic pro-Radio promos for your listening enjoyment (they are not authorized for airplay), courtesy of the Radio Advertising Bureau.
Freberg - "Cherry"
Freberg - "Walking in My Mind"
Leno - "Banana"
Leno - "Airplane"
