获取板载扬声器音量：LD_LIBRARY_PATH=/opt/bluez-alsa/lib /opt/bluez-alsa/bin/amixer sget "DAC LINEOUT"
设置板载扬声器音量：LD_LIBRARY_PATH=/opt/bluez-alsa/lib /opt/bluez-alsa/bin/amixer sset "DAC LINEOUT" 30%
板载扬声器播放声音：LD_LIBRARY_PATH=/opt/bluez/lib:/opt/bluez-alsa/lib /opt/bluez-alsa/bin/aplay /root/music/wav/Sand.wav

获取蓝牙音量：LD_LIBRARY_PATH=/opt/bluez/lib:/opt/bluez-alsa/lib /opt/bluez-alsa/bin/amixer -D bluealsa:SRV=org.bluealsa,DEV=DC:D8:7C:1E:CA:CD sget "A2DP"
设置蓝牙音量：LD_LIBRARY_PATH=/opt/bluez/lib:/opt/bluez-alsa/lib /opt/bluez-alsa/bin/amixer -D bluealsa:SRV=org.bluealsa,DEV=DC:D8:7C:1E:CA:CD sset "A2DP" 15%
蓝牙播放声音：LD_LIBRARY_PATH=/opt/bluez/lib:/opt/bluez-alsa/lib /opt/bluez-alsa/bin/aplay -D bluealsa:SRV=org.bluealsa,DEV=DC:D8:7C:1E:CA:CD,PROFILE=a2dp /root/music/wav/Sand.wav