Re: No voices during dialogue
Have you tried making the change in your Windows Control Panel -- Sound settings? (The "wrong" setting there is the most likely cause of the issue if you're hearing the other sounds in the game.)
Below are my settings; 5.1 Surround. Normally, everything works as expected. But when I plug in my Bose headphones to the 3.5mm jack on my speakers' EXTERNAL volume control dongle then Windows doesn't know that I don't have a center speaker. So in that situation any audio it directs to the center speaker is simply dropped. (I discovered this while playing the original Windows Solitaire. I still heard the shuffling of the deck, but lost the sound of cards moved to the stacks.) The jack located on the computer itself was already set to "Stereo", so no problem if I used that one,
Here's the Control Panel item I'm talking about:
Let us know if changing the setting works. 🤓