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update rpi doc, add info about adjusting mic sensibility level

nico 8 years ago
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      Docs/installation/raspbian_jessie.md
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      images/alsamixer_mic_level.PNG

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Docs/installation/raspbian_jessie.md

@@ -121,6 +121,13 @@ Restart alsa to apply changes
 sudo /etc/init.d/alsa-utils restart
 sudo /etc/init.d/alsa-utils restart
 ```
 ```
 
 
+You can adjust the microphone sensibility by running alsamixer:
+```
+alsamixer
+```
+And then select your microphone device by pressing F6 and finally move up the `mic` sensibility level
+![logo](../../images/alsamixer_mic_level.png)
+
 To ensure that you can record your voice, run the following command to capture audio input from your microphone
 To ensure that you can record your voice, run the following command to capture audio input from your microphone
 ```
 ```
 rec test.wav
 rec test.wav

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images/alsamixer_mic_level.PNG