i have osx 10.6.8

Me too.

I plug the Arduino via USB.
Open Arduino software and upload the sketch.
"play" a couple of piezos to confirm i get the TX light in arduino board.
Open Processing and the SMv2d sketch.
Run the sketch.

Sounds OK as well, as long as the arduino serial monitor window is not open.

When I run processing I just get:-

Stable Library

Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7

That error message :-
RXTX Warning: Removing stale lock file. /var/lock/LK.008.011.010
might mean you have to find that file and then delete it. Then restart processing, worth a try.