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how can I use a USB audio key on my raspberry pi 3? I would like to plug a microphone into the Pi and record my voice.

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A quick way to do this is to connect a USB microphone to your Pi, open a terminal window and run the following command:

arecord /home/pi/Desktop/a.wav -D sysdefault:CARD=1

The Pi will then start recording sound from the microphone. When you have finished recording leave a gap of 6 seconds then press CTRL+X on your keyboard to close the terminal window. The file will save automatically.

The /home/pi/Desktop part of the command determines the save location of the file and the a.wav part is the name of the file

To playback the file run:

omxplayer -p -o hdmi /home/pi/Desktop/a.wav
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