Device/guide

Drill ('ドリル)
Enter the Woodlands. Go right from the door, then go down and interact with the tree with holes in it. Go up and interact with the drill.

Marionette (マリオネット)
Enter the Music Tiles World. Go down a bit and right from where you'd get the Synthesizer effect and go between the two hands. Go through the end of the hall then go down the door. Go down the stairs and through the door to the Puppet Museum.

Go to the end of the hall. Keep going left until you reach a dead end, go up and enter the door beside the puppet version of yourself. Interact with the puppet with the red hair.

Dark Suit ('ダークスーツ)
Enter the Bloody Music Note World. Go left and down from the entrance and go between two white S shapes with circles around them. Go right and up from where you're teleported and find and enter a gray fence. Enter the mansion. Go up both sets of stairs to the left then enter the doors on the left of the third floor. Interact with the suit in the middle of the room.

No Sound (おとなし)
Enter the Bloody Music Note World. Head straight down from the door until you reach a set of earbuds with blood coming out from it. Go right until you see a small puddle of blood near a blue CD below you. Interact with the puddle to get the effect.

Synthesizer (シンセサイザー)
Enter the Music Tiles World. Go straight down from the door until you reach a group of dancing NPCs. Interact with the NPC on the platform.

Hang Glider (ハングライダー)
Enter the Cloud World. Go down and right from the door and find a small paper airplane floating about. Interact with it to get the effect.

Short Hair (ショートヘアー)
Enter the Music Tiles World. Go right and down a bit from where you'd get the Synthesizer effect and go between two large hands. Go down the hallway then enter the door with a scissor sign next to it. Interact with the NPC wearing the mask to get the effect.