[Audio] No sound on the AAC, MP3, soundtracks, or YouTube
Consequently, if you have accidentally lowered the sound volume on your Zappiti, there will still be sound on your bitstream (RAW) audio streams such as DTS for example, but there will be no sound on the trailers, playback of audio files such as MP3, YouTube, soundtracks (soundtracks on posters) and movies recorded with an AAC soundtrack.
To have sound again, simply return the sound volume to its initial position using the VOL+ button on the Zappiti remote control.