IN MATHEMATICA:

 

Play[Sin[2 Pi 440 t] , { t, 0, 2}]

 

Play[{Sin[2 Pi 440 t] + Sin[2 Pi 444 t]}, { t, 0, 2}]

 

Play[{Sin[2 Pi 440 t] , Sin[2 Pi 444 t]}, { t, 0, 2}]

 

Play[Sin[700 t + 25 t Sin[350 t]], {t, 0, 4}]

 

 

 

 

 

Mathematica 5.1:
-------------------------
Mac: 09582-18929-64015-32674-18800-651
PC:  20114-26608-22772-46552-28096-651
 
Mathematica 5.2:
-------------------------
Mac: 06154-01833-52788-29241-12185-651
PC:  21968-14478-27208-19143-31385-651