SPBSignInDevice
short deviceRefNum; a device reference number
Str255 deviceName; the name of the sound input device with the Sound Manager before they can use its sound input services. You might call this routine at system startup time from within a resource of type
'INIT' to install a sound input driver.
deviceRefNum a device reference number
deviceName specifies this device's name as it is to appear to the user in the
Sound control panel (which is not the name of the driver itself).
Accordingly, the name should be as descriptive as possible. You should
call SPBSignInDevice after you have already opened your driver by
noErr (0) No error
siBadSoundInDevice (-221) Invalid sound input device
Notes: You can get information about registered devices by calling