Sadly I believe this to be a hoax [0] but has been used several times as an interesting plot device - notably in G Benford's short story Time Shards (which I have not read). Similarly it has been proposed that stone stores electrical mental impressions [1] - again the subject of a quite wonderful TV play written by Andrew Nigel Kneale [1]. The most interesting version of the pottery-as-recording story is the one which proposes that Jesus's voice was recorded onto pottery - once in the X Files [0] and, to my knowledge, once in a BBC radio play, where Jesus's final recorded statement is the major plot point (sadly I can't find a reference to the play - but it could indeed be based on the short story of G Benford).
https://www.youtube.com/watch?v=npNYP2vzaPo
And now sound from paper/pictures.