It's the best learning app ever!

Everything is doing really great but i am wondering if the voice model of "Sarah" could be younger? No offense to the voice model yet she sounds a bit like an old lady that makes me fall asleep (idk why sometimes she sounds creepy). The voice model like a year ago is really great. Is it possible for us to choose the voice of podcasts in the future? Except this, I deeply appreciate this wonderful app. Thank you for all your effort!