Problem with Piezo & Arduino2max

Hi all,

Ok, I have an Arduino NG connected to a Mac Intel through USB. I m trying to make a very simple system where I could receive data from a piezo sensor into MaxMSP. After having followed the Knock tutorials and uploaded the sketch into the Arduino, everything works fine; by tapping on the Piezo, the TX led blinks and the serial monitor displays “Knock!”. Now, when opening Arduino2max patch in Max (after having closed Arduino 08 app?) if I click “start” the RX led will begin linking accordingly to the metro sample rate, but I don't get any reading for the analogue sensor. I have tried two different boards, different analogue input pins, slowing down the metro to 1000 ms, but no success? Any suggestion? Many thanks