Recorded Talk
Chicago Manual 14.264; 15.57
See examples below:
Notes-Bibliography Style
       1st Footnote or Endnote
           1. Harry S. Truman, "First Speech to Congress," April 16, 1945, Miller Center   
       of Public Affairs, University of Virginia, transcript and Adobe Flash audio, 18:13, 
       http://millercenter.org/president/speeches/speech-3339.
       Bibliography
       Truman, Harry S. "First Speech to Congress." April 16, 1945. Miller Center of   
           Public Affairs, University of Virginia, transcript and Adobe Flash audio, 18:13, 
           http://millercenter.org/president/speeches/speech-3339.
Author-Date Style
       1st Parenthetical Note
       (Truman 1945)    
       Reference List
       Truman, Harry S. 1945. "First Speech to Congress." April 16. Miller Center of   
           Public Affairs, University of Virginia, transcript and Adobe Flash audio, 18:13, 
           http://millercenter.org/president/speeches/speech-3339.