Harp pedals and joystick: what they have in common

1. Step 1. Harp pedals — is part of — Harp. Pedals retune the strings by a semitone.
2. Step 2. Harp — evolved into — Guitar. Plucked instruments.
3. Step 3. Guitar — evolved into — Electric guitar. Electrification.
4. Step 4. Electric guitar — has part — Potentiometer. The volume and tone knobs on an electric guitar are potentiometers.
5. Step 5. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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