freq - frequency (sample rate) of sound playback; defaults to 22050
size - 8 or 16, for 8- or 16-bit unsigned data; -8 or -16 for 8- or 16-bit signed; defaults to -16
buffersize - number of samples to send to hardware at one time; defaults to 1024
Note: a larger sample size improves playback (less chance of dropouts), but increases latency