shiznatix:
Don't worry, all of my pins are connectedSo, I should be using a 1Kohm resistor? The tutorials I have read always say 1Mohm: example here.
If they are connected then the readings aren't necessarily spurious pickup, but
at that impedance you will see some crosstalk, its fundamental with a shared ADC
and multiplexing.
Perhaps you should ignore all but the channel with the largest response at each
point in time, so that it effectively is masking out the other channels.