How to beep usnig PC Speaker, not sound card.

[Exit]

When the headset is plugged in, you cannot hear warning sounds when  headset is not near the ears.

Therefore I want to use the PC speaker.

Found a solution here, but it does not produce any beep on my WIN 8.1 X64 System.
Speaker is installed. I can hear one beep at POST time.

Here the code:

;  Include files may be found here: https://www.autoitscript.com/forum/topic/121084-io-port-functions



#include "IOFunctions\[Includes]\_IOBeep.au3"
; ===============================================================================================================================
; <IOBeepExample.au3>
;
; Example use of _IOFunction's _IOBeep.au3 - Sends a Beep to the PC speaker.
;
; Reference:
;   See trancexx's post:
;       'CMOS' Beep: http://www.autoitscript.com/forum/index.php?showtopic=106878&view=findpost&p=754720
;
; Author: Ascend4nt, trancexx for the _Beep() function
; ===============================================================================================================================


; ===================================================================================================================
;   MAIN CODE
; ===================================================================================================================

If Not _IO_Initialize() Then Exit _
    MsgBox(48,"DLL or IO Driver failed to load","DLL or IO Driver failed to load, possibly due to an install issue."&@CRLF& _
        "If this is the first time using the DLL/Driver, please run the driver install."&@CRLF&"(Either IOInstallx86 or IOInstallx64)")

_IO_Beep(440,5000)

; Unload the DLL
_IO_UnInitialize()

This code is from Ascend4nt and Trancexx
And there codes are known as superior.

So, where is my fault?

TIA Exit

[UEZ]

Have you tried this?: https://www.autoitscript.com/forum/topic/145528-beepsongeditor-v1024-create-beep-songs-and-mp3-ringtones