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great project. i try to combine it with my mp3shield - and therefore only have the pin 10 free instead of pin 9 - that should work, shouldn't it? I just changed the pin 9 to 10 in the code. It seems to work ( i can see my arduino picks up the different touches - ) but it does not change the sound of the mug depending on where I touch the mug... any idea? Thanks for your help!