How to Add USB Audio Devices

Use the following procedure to add USB audio devices.

1. Plug in the USB speakers and microphone.

   The primary audio device, /dev/audio, usually points to the onboard audio. After you connect USB audio devices, /dev/audio points to the USB audio devices that are identified in the /dev/sound directory.

2. Verify that the audio device files have been created.

   % ls /dev/sound 0 0ctl 1 1ctl 2 2ctl

3. Test the left and right USB speakers.

   % cd /usr/share/audio/samples/au % audioplay -d /dev/sound/1 -b 100 spacemusic.au % audioplay -d /dev/sound/1 -b -100 spacemusic.au

4. Test the USB microphone.

   % cd $HOME/au % audiorecord -d /dev/sound/2 -p mic -t 30 test.au