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To aid us in the recording and playback of sound files, we'll install the absolutely invaluable sound eXchange(soX) application - the Swiss Army knife of sound processing. SoX is a command-line utility that can play, record, and convert pretty much any audio format found on planet earth.
Type in the following command to install SoX and an add-on that deals with MP3 files:
>sudo apt-get install sox libsox-fmt-mp3
Now type in the following command to start what we call a monitoring loop:
> sox -t alsa plughw:1 -d
If everything is working right, you should be able to speak into the microphone and hear yourself from the monitor or desktop speakers with a very slight delay.
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