alsa* --声卡库支持

• The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system. ALSA has the following significant features:
  Efficient support for all types of audio interfaces, from consumer sound cards to professional multichannel audio interfaces.

ubuntu下安装

zw@zw-pc:apt-get install alsa-base alsa-utils 
zw@zw-pc:alsamixer --help
Usage: alsamixer [options]
Useful options:
  -h, --help              this help
  -c, --card=NUMBER       sound card number or id
  -D, --device=NAME       mixer device name
  -V, --view=MODE         starting view mode: playback/capture/all
Debugging options:
  -g, --no-color          toggle using of colors
  -a, --abstraction=NAME  mixer abstraction level: none/basic