You can use this function when the file’s volume is not enough to watch.
[Boost one file only]
Press the settings button, after tapping the screen.
Tap the Audio button and slide to your preference.
* The boost only adjust certain video and it save automatically.
[Boost all files]
Tap Settings at the bottom and select Audio.
Adjust the boost level as you want.
※ Although you boost all files, the boost level applied to one file takes precedence.