With all of my JT HPS/JT Software games, I actually play with all the sound and music set to "on" however, I have my speakers turned off, all of the time. I found out if I don't do this, the replay of my opponents turns moves super quickly, sometimes making it impossible to determine who is firing at my units. Having all that "extra stuff" running in the background, slows the replay speed down.
Have you tried HPS Support?
[email protected]
I guarantee you will find out quickly what's going on. :)