Beyonwiz FV-L1 - Manual (Page 48)

STB & PVR Function
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1-3. Volume Level Adjust
Use the VOL+/VOL- buttons respectively to increase or decrease the
level of the analogue and the digital audio outputs. The MUTE button
will turn off both the analogue and digital audio outputs. You can
cancel the mute function by pressing the MUTE button a second time,
or by pressing either of the VOL+/VOL- buttons.
NOTE

If you have set the audio format to “passthrough” (see “Audio
Outputs” section in Chapter 4), you cannot control the volume level of
the digital audio outputs set to AC3 or Dolby Digital 5.1 audio. In
these cases, you must use the remote control of your audio decoder
(e.g. amplifier) to adjust the volume level.
1-4. Soundtrack Change
If the current TV program provides more than one language or audio
format (e.g. MPEG audio and Dolby audio together), you can change the
setting while you continue to watch the program. Press the
SOUNDTRACK button to show a list of the languages and audio
formats available. Use the UP/DOWN buttons to select your desired
setting and then press OK to change it. To hide the list, press the
SOUNDTRACK button a second time, or press EXIT.