Arduino as Capacitive Sensor

Hello all,

I am currently working with the CapSense library to create capacitive sensors with Arduino. I managed to make some sensors (made of copper wire) work but I will need 16 sensors (there are no enough digital pins for that). Does anyone have experience with using a 4051 or 4067 analog multiplexer with capacitive sensing?

Thanks in advance.

PS. The sensors do not have to output super-precise values.