Beyonwiz DP-H1 - Manual (Page 49)

STB & PVR Function
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1-3. Volume Level Adjust
With the VOL+/VOL- buttons, you can adjust the volume level of the
analog audio output. The MUTE button will turn off the analog and
digital audio outputs.
NOTE
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You can not control the volume level of the digital audio outputs if you
set the audio format as “pass-through”. Therefore you have to use
the remote control of an audio decoder (such as an amplifier) to
adjust the volume level if you are using digital audio out.
1-4. Soundtrack Change
If the current TV program provides more than one language or audio
format, i.e. MPEG audio and Dolby audio, together, you can select one
and change to that setting while you are watching a TV program.
Pressing the SOUNDTRACK button on the remote control will pop up a
list box contains the languages and audio formats you can choose.
Please select an item with the UP/DOWN buttons and press the OK
button to change it. You can cancel and hide the pop-up list by pressing
the EXIT button.