I wish the audio on those videos was a little higher, it's sometimes hard to understand.
But the audio on these day 3 videos are OK, right?
I think you are referring to day 2 part 1 and 2, the synced versions of day 2 have slightly louder audio (boosted as much as the YouTube editor was able). Hopefully it is enough for you to be able to hear what is said.
Day 2 Part 1:
https://www.youtube.com/watch?v=qw8iQ3e-lvM&index=4&list=PLPQ6KZ-AGhVRhA0EyktgPEEoMlS_B2J7I
Day 2 Part 2:
https://www.youtube.com/watch?v=iMNd1iwKjco&index=5&list=PLPQ6KZ-AGhVRhA0EyktgPEEoMlS_B2J7I