I visited the link and another model of Talking House, model TH 4.6, popped up in eBay's suggestions. This one has a "live radio" mode (as opposed to using a recorded message) as well as line-input and microphone jacks. I have no familiarity with these, but it would appear this one could be used as a converter box for analog audio sources.
https://www.ebay.com/itm/134017704532
https://www.ebay.com/itm/196443606158