I assume you are referring to Bp. Sheen who merely wrote the preface to volume one of Radio Replies. The authors of Radio Replies are Fathers Rumble and Carty and as far as I know there is no audio version to the series of books authored by them.
I gladly give you the link to the website, having I believe just about everything Bishop Sheen ever put out on tape:
There’s an app. Thank you so much.