I tried out the AIStudio in Googleland today. For free you can only go so far before your, um, whatever it is you run out of, runs out. I'll go back tomorrow and see if I have more of them.
In the video below, I used the "Live audio to audio dialog" feature. There are options to change the voice and an option for what I guess is a more affective tone? It also has an option to make the tool not respond to audio that is not relevant to the topic at hand.
The video below uses the default "Zephyr" voice.