adau1761 setting

Hi!

I have a question about the adau1761 setting.

1. I'm trying to use one analog microphone. How do you connect to adau1761 analog input and process the remaining unused analog input ports?

2. Please refer to PCB design to minimize white noise as much as possible.

3. When you use one analog microphone, does the Sigma Studio's Record Input Signal Path activate IN 1?

Thank you.