When I play Synthesia, I usually end up with more mistakes than usual, even on the simplest songs. This is because my hands have fine motor issues, and this makes playing piano a little difficult. Touchscreens? Even harder. Maybe there could be a sensitivity option?
I don't have Parkinsons. Some people are born with slight motor issues in their hands.
Motor neuron issues and Synthesia
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It means it would not respond as fast. By default, this would be set at 100%. At 0, it would take quite a long while to respond. This delays the initial message time from the input device, like a keyboard on a Mac or PC. That is what a sensitivity option is. Also, touchscreen sensitivity for mobile devices works by making the input less responsive (hold longer on the screen) the closer it is to 0.