Sound

From AlwaysInnovating

To change sound and volume settings, use the Sound control panel, available at Start -> Control Panel -> Sound.

The following keyboard shortcuts are also available:

Key Combination	Effect
Fn + F8	Mute
Fn + F9	Decrease volume
Fn + F10	Increase volume

You can also directly access the sound settings in command line with amixer and alsamixer. Press tab to go from sound out to sound in settings.

To record some sounds, there are two options available:

• The line-in which is usually used to plug a CD. The jack is at the top on the side, just below the USB connectors. To make it work:

amixer -q set 'Analog' 50
amixer -q set 'Analog Left' 'AUXL'
amixer -q set 'Analog Right' 'AUXR'
arecord -t wav -c 2 -r 44100 -f S16_LE -v test.wav

To play the sound:

aplay -t wav -c 2 -r 44100 -f S16_LE -v test.wav

• The headphone which can be used as microphone. You need to have a headphone with a micro such as the one provide with the Palm Pre or the iPhone. The jack is at the bottom on the side, just above the AI button. To make it work:

amixer -q set 'Analog' 100
amixer -q set 'TX1 Digital' 100
amixer -q set 'Analog Left' 'Headset mic'
amixer -q set 'Analog Right' 'Off'
arecord -t wav -c 2 -r 44100 -f S16_LE -v test.wav

To play the sound:

aplay -t wav -c 2 -r 44100 -f S16_LE -v test.wav