SPBSignOutDevice
SPBSignOutDevice Unregister a device with the Sound Manager
#include <SoundInput.h> Sound Manager
OSErr SPBSignOutDevice( deviceRefNum);
short deviceRefNum; a device reference number
returns Error Code; 0=no error
The SPBSignOutDevice function unregisters the device whose driver
reference number is deviceRefNum; the device is unregistered from the
Sound Manager's list of available drivers.
deviceRefNum a device reference number
Returns: an operating system Error Code.
noErr (0) No error
siBadSoundInDevice (-221) Invalid sound input device
siDeviceBusyErr -227 Sound input device is busy

Notes: You can get information about registered devices by calling
SPBGetIndexedDevice. You can register your driver by calling