update with microphone gain stuff

README.md

@@ -9,7 +9,7 @@ lpadmin -p brother -E -v "ipp://10.100.0.205/ipp/print" -m everywhere -L "Mom's
 manual adding is needed as network hostname resolution fails becuase yeah.
 If it didnt fail, hardcoding a dynamic IP address like this wouldn't be wouldn't be necessary.
 
-## Webcam
+## Webcam / microphone
 v4l2 may create multiple nodes in /dev for different formats
 one example being mine which puts the H264 stream on /dev/video2
 
@@ -19,9 +19,14 @@ v4l2-ctl -d /dev/video2 --set-fmt-video=width=1920,height=1080,pixelformat=H264
 and this will record it with zero latency:
 mpv av://v4l2:/dev/video2 --profile=low-latency --untimed
 
-this works on framework laptops: (not sure why, but setting MJPG with v4l2-ctl doesnt make mpv pick 1920x1080 by default...)
+framework laptops: (not sure why, but setting MJPG with v4l2-ctl doesnt make mpv pick 1920x1080 by default...)
+
 mpv --demuxer-lavf-o=video_size=1920x1080,input_format=mjpeg av://v4l2:/dev/video0 --profile=low-latency --untimed
 
+microphone gain is defaults to 100%, which is way too loud. set it to something lower with amixer, provided by alsa-utils:
+-> amixer set Capture 40%
+
+
 ## fprintd
 firstly, enroll with
  - fprintd-enroll