What happened to Audio?
This is important.
Why?
Because Jack ran into the burning house to save the damn dog!
We're led to bellieve this why Kate almost eats herself to death.
The entire series revolves around Jack's death and there was one episode (or maybe 2 ?) or 3, or 4 about the fire.
So where did audio go? Did he go upstairs and jump out the window?
Where did Audio go???