How to switch audio streаms?
1. Tap the screen in video view mode to display the application tools.
2. Press the Settings button in the lower left corner 
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3. Choose Audio streams and select the required.
Note, that you can choose the soundtrack by default in the Settings section.
2. Choose Playback→Default soundtrack→choose the language of the soundtrack.
If default soundtrack is not available for current video, then the video plays with the first available soundtrack.
