http://www.bbc.co.uk/programmes/b04pbqtg
From the Jack London Society site
The BBC has a podcast up with some thoughtful reflections on his work and ideas from writers Aminetta Forna, Tobias Wolff, and Susan Mizruchi, among others. At about minute 23, London’s voice can be heard.
Donna M. Campbell 
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Hi Donna, I hope you are doing well. Do you happen to have heard the entire recovered sound of Jack London, please? Do you happen to know how to obtain that recording please? Thanks alot!
Hello Nina–I don’t know any more about how to obtain this recording (sorry!). If you find out, the link can be posted to the site. Best, Donna