Hey there 
I use the chromecast binding and my nest Hub (and chromecast audio) as an audio sink for openhab to let them say things.
However I do have an issue: I can’t replicate the original google voice. Let me give you an example:
This is the normal voice of google assistant link and this is it when I send a message from openhab to the device link.
I tried my best to make the voice (when sent from openhab) sound as normal as possible with these settings:
and this is my command
say(“Dies ist eine Testnachricht welche mir von openhab gesendet wurde”, “googletts:deDEWavenetE”, “chromecast:chromecast:XXXXXXXXXXXXXX”)
however as you can hear these sound quite different
Does anyone know how to make the text sent from openhab sound like the native sound from google assistant?