Im trying to get my Arduino Duelmillanove to talk to my Raspberry Pi running Pd-extended and Rasbian.

Typing "dmesg | tail" into the terminal reports that the Arduino is attached to /dev/tty/USB0

so as usual I type this into the creation argument for the arduino object:

[arduino /dev/ttyUSB0]

However the Pd console reports

[comport] **ERROR** could not open device /dev/tty/AMA0

Why is Pd trying to use AMA0 when I tell it to open ttyUSB0?

Just found that an Arduino Uno will work fine,