ATtiny85 CV input is unprotected from high voltages.
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Kneelawk commented
The CV input to the ATtiny85 LED controller is powered by an op amp that is powered from a +-12V supply. This +-12V supply is necessary for the op-amp because its output cannot swing all the way to its supply rails, but this does mean that its output can go above +5V or below 0V. If the CV input to the ATtiny85 goes above +5V or below 0V, it could damage the ATtiny85.