I remember playing with these as a developer back in the PS2 era and finding the output from the buttons wasn't very controllable. I was just taking the pressure reading and drawing a bar graph and then various people would have a go at trynig to press the button with 50% pressure or with 25% pressure, etc. Nobody could really manage much accuracy and it proved difficult to input a steady pressure, so it felt a lot like you'd really only be able to split it into two levels or such. eg. pressed lightly and pressed hard, but nothing particularly useful.
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