$23 childrens keyboard from walmart with 3 modifications
the knob is a potentiometer set such that when it shorts two points the tempo and pitch of everything it plays shifts up.
the 3-state switch shorts a point A to B or C, where in B, some keys and some buttons will squeal like feedback when pressed, and in C, the whole systems in noise mode and holding different keys modulates it and make it crazy
the button shorts some other two points when pressed, triggering something random, either a note or a different song
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