its a miniscule change, with propper resistance spacing and code to allow a wider range its not an issue, ive with a 8bit in you can set it as a example of 0-16-32-48 etc.. and its going to line up right in the middle of those numbers if you do it right so any play will still be caught in the range... however ADC keypads have major errors if 2 or more keys are pushed cause that just sends eratic results.pushing 3 and 9 might give you 4, who knows.