Gilligan,
Niels answers with 2 tones. The first one is either happy or angry. This is in response to whether you did right or wrong.
If you are right, he is happy.
The next tone he makes is the question. This you must answer with the flute.
To answer, click-select one of the holes and then use the wind on the bottom hole.
If he likes your answer, he will make a happy sound; if not angry.
You have to do 7 correct answers before the puzzle is done.
Or you can do backspace key and hopefully the puzzle is bypassed.