icted to a page of virtual memory.</font>

<p><font face="Times">As an NXSoundStream delivers sound buffers to the sound driver, the sound driver sends back Mach messages to the NXSoundDevice class, messages that report on a device's status and, for recording, deliver freshly recorded data.&nbsp; The NXSoundDevice class forwards this information to the delegate of the appropriate NXSoundStream.&nbsp; The delegate methods defined by the NXSoundStream class mark general watershed moments in a stream's career: