I also found some of the voices (T'Pol's mainly) very difficult to hear because of muffling.
Unfortunately unavoidable due to varying recording methods. Everyone used different ways to record their voices. Some good equipment, some not so good, some probably used some very basic PC mics.
It's one thing to clean up noise but quite another to fix post recordings. I pretty much have convinced myself that noone is rich, noone is getting payed, so just record as best you can and I'll slap it all together as best as possible.
Some of the audio also fades quiter or bursts louder, there's no way to find a way to balance that other then picking a level and leaving it.
PS:
<-- Mixer for episode one
This would have been much better but I've had some family health problems recently and have vowed to go back and retool later on when things get back to normal. But with part 2 having a... difficult release date that probably won't happen soon.
PPS: I gave it an "Ok" rating as I am my own harshest critic.