It must be taken into account that the button shorts the ground pin and that of the microphone. So sometimes it activates the color picker. I suppose that it will be solved with the pressure sensor or some sensitivity adjuster, so that it prevents the pressure sensor from completely making the short dedicated only for the button.Definitely, or a potentiometer, with a gear and rubber or a spring.
You beat me to it hahaha! I'm looking for one of my crappy headphones with a mic on it for a 4 pin headphones so that I could test a volume nob. My switch is ready though.
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This piece is available on CD players (KSS). I did not find the right name to find it online.