* audio
audacity -- professional audio editor
(help to see the audio wave pattern or spectrum)
amixer -- command line mixer tuning program
(another is alsamixer in GUI mode)
arecord -- alsa command line audio recording program
*video
glxgears -- 3D testing tool
(quick to figure out the 3D performance)
xrandr -- command line interface to check and use the video port
(can check the all connecting video interface and output the video signal to dedicate device)
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