Output audio volume control 输出音量控制
Note that when the currently active audio output device does not support volume control (such as an A2DP device), the volume slider is replaced by the appropriate device name.
注意如果当前的声音输出设备不支持音量控制(就像设备A2DP)，音量滑块就不会显示，取而代之的是设备名称。
It also has a headphone output with volume control.
它还具有耳机输出量控制。
Some DVD players have a digital volume control on the digital output.
一些数字化视频光盘驱动器有数传体积在数传输出方面的控制。
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