The app contains phonemes in several voices. Just 44 phonemes make up every word and every name, ever.
Type "EchoVox audio Pareidolia" into any search engine and you will learn the truth about how this works. Go ahead!
It is designed to fool your brain into thinking you are getting messages. Thats all that is happening here. Nothing paranormal. And with a little research you can conclusively prove that for yourself.
DoctorObvious about EchoVox