Have you tried...

Hint 1 of 7:

...putting the spheres together, using wands/staves/etc., or using a scroll
in the presence of the old woman?

Hint 2 of 7:

...using the various hurdy-gurdy functions while in a room with any of the
other characters (the old woman and the sailor especially)?

Hint 3 of 7:

...eating a truffle while the Minx is with you?

Hint 4 of 7:

...defeating the Snow Wight with the Sayonara wand?

Hint 5 of 7:

...using the Levitation wand on the Reliquary (before you save Thriff)?

Hint 6 of 7:

...using the bearskin rug to shock the various characters of the game?