Audio and image recorders were only invented in the late 1800's, but it took many years since we could actually have these at home and use them to document ourselves, family and friends. When I look at pictures of my ancestors, some from centuries ago, I can try to imagine how they looked like in a daily basis, how they walked and moved. But it's impossible to know how they talked, how were their voices like, if they spoke Portuguese well (being Yiddish/Russian/Romenian their native languages) or had any accent.
It's a challenge to try to depict my grandparents and their parents' lives. And in this journey into the past, it's even more difficult to figure out sounds, more than images. It's easy to have a song or tune in mind, but when we talk about sounds, it's a different thing. Somebody can try to describe a kind of voice, but it's still hard. Sounds gives depth, meaning. And in getting to know our ancestors' voices we could have a more complete picture of their personalities and characteristics.There's so much we can learn from it.
Documenting not only your relatives' images, but also audios, will help to keep a more reliable memory alive.