Tone() function on TC375

Hi, I could not get the Tone function on the TC375 working, compile and upload works fine, but not a single beep ;-). All the other stuff on the pin is working fine, the pin is fine and I tried on two different Shieldbuddies and different versions of Arduino. For comparison I tried the same programs on the TC275D and everything is working fine. Are you dead sure that tone is working on the TC375 ;-?


Thanks