INT 1A - SND - STOP SOUND                                                       
	AX = FF03h
Return: AH = status
	    00h successful
	    01h busy
Note:	turns off any sound currently being emitted by the PCIBM PC's speaker unless
	  SND is currently busy processing an API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. call (this includes
	  background music).  Use AX=FF05h to stop the sound even if an API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes.
	  call is in progress.
SeeAlso: AX=FF00h,AX=FF02h,AX=FF05h