Problem with Softpot Ribbon sensors

Hi,

I'm designing a noiseless violin.

I'm trying to read the value of two Softpot Ribbon Sensors (purchased at Sparkfun) using A0 and A1 as analog inputs.
I have detected two troubles:

1. It seems the sensors have an offset ( when not pressed they should give about 0, but I read 400). They are new, never used.

2. When I press one sensor, the other seems to be affected as well.

I attach the wiring and the program I use.

Thanks in advance for any suggestion.

Regards,
Alex

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