GUIDING SOUND

From: Carlos Light
Description: When I picked up the strange signal, I immediately tried to decipher it. These mysterious vibrations are similar to those emanating from our artifact, the Key of Dreams. Maybe we’re on the trail of another key? Help me build an improved transmitter to track the signal!
Completed: The improved transmitter has confirmed my theory that we picked up another key’s signal. I think this is the Key of Sound, as its signal alone creates energy flows. But the bad news is that according to my information, the Key of Sound is in the Shadow’s lair...