Wolgraff has plenty of voiced lines when finding secrets, going through some events and as a reaction to some of our choices. I felt he had more lines than Madora and Jahan, but most of his voices are played by the tomb narrator.
Bairdotr has few voiced lines indeed, but I'm certain there is more than one instance.
In the Ruby and Troll sidequest, for example, she has a voiced commentary.
But it doesn't help that sounds are really bugged in the game. Many lines (and sound effects) are frequently not played.
