You can also install PulseAudio addition to ALSA.
You need root permission for the installation. Download pulseaudio.tar.gz and extract it. Then run 'sh 000_all' to automatically install PulseAudio. The scripts are compiling libsndfile and pulseaudio, adding the user 'pulse' and installing the file '/etc/dbus-1/system.d/pulseaudio.conf'.
You have to restart the computer to activate PulseAudio.
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