External microphone does not work on linux debian 9

I am not able to use an external microphone in debian 9, I have installed the main package alsa and all its derivatives, my audio driver is Realtek ALC269, I installed the pulseaudio program, but it didn't work out, I did some research and said it could be the configuration of alsa base, however in debian 9, the package was removed, so I don't know what to do, I will leave some pictures, about my audio settings, whoever can help solve this problem will be very grateful, att.

https://i.stack.imgur.com/m4Slc.png
https://i.stack.imgur.com/jQKSz.png
https://i.stack.imgur.com/P2f3j.png
https://i.stack.imgur.com/NZl1u.png