I want to call Urm

Hint 1 of 7:

Use a flute!

Hint 2 of 7:

Make a flute

Hint 3 of 7:

Use the bamboo and the knife

Hint 4 of 7:

If you don't have the knife, see another hint in this section

Hint 5 of 7:

The bamboo is on the floor to the right of the Revuss