For some reason, the voice and gun sounds all come up slower and deeper than they should. Is anyone else having this problem? Anyone know how I can solve it?

It's because you're lagging and Cortex Command now just slows the game and sounds down instead of just skipping frames. You can turn it off with ctrl+o or m or something....

Apparently you can also slightly adjust the base speed with ctrl+1 and ctrl+2, or maybe ctrl+3 and ctrl+4... I don't remember if it's changed, 1 and 2 used to do it.