even though it works fine for me in Pharo 5 (with the exception I have to restart the sound player because the primitive fails at times) in Pharo 4 I have no sound and no errors. Just Silence of the Lamps.
opened bug report https://pharo.fogbugz.com/f/cases/17402/Pharo-Sound-does-not-work-on-Pharo-4
