I've heard of the Phob, What is it?

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The PhobGCC is a replacement motherboard for Gamecube controllers that reads stick position using magnets and Hall effect sensors instead of potentiometers that can wear out. It offers an advanced digital snapback filter that doesn't reduce responsiveness and actually improves responsiveness in Melee. It also features gate calibration, swappable buttons, customizable triggers, and facilitates installation of discrete switches on the D-pad and face buttons.

This comes together to make a high-performance, customizable, long-lasting controller