I have the multimedia, I have sound during the initial video, but the sound stopped after the first research completed.
On reloading the game (my flagship showed 4/0 moves left, which also happened in the Beta), the music was again OK until the first popup screen arrived (I met a new alien race)
Looking closely at the sound options, I then noticed that they were on 90, on a scale of 0 to 10000. Increasing them to the halfway mark worked fine.
Can it be that the slider was reset to 90 ? I had NOT touched it before...
One more thing, the maximum value of 10000 of the sound sliders does not fit the box, and is displayed as (100..)
The game looks GREAT !