root@RK356X:/# amixer scontrolsSimple mixer control 'Master',0Simple mixer control 'Playback Path',0Simple mixer control 'Capture MIC Path',0
其中的Master就是主音量。设置主音量为20%：
amixer sset Master 20%
root@RK356X:/# amixer sset Master 20%Simple mixer control 'Master',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 100 Mono: Front Left: Playback 20[20%][-24.00dB] Front Right: Playback 20[20%][-24.00dB]
播放音乐：
root@RK356X:/# aplay /mnt/test.wavPlaying WAVE '/mnt/test.wav': Signed 16 bit Little Endian, Rate 22050 Hz, Stereo
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