Mic volume (output) missing - ACER

[lapaj]

I am missing "mic volume" in master volume. There is no possibility to add the control for the microphone. Used Acer notebook TM6593, up to date drivers realtek HD. Any idea for solution? I need to hear what I am saying to the microphone...
WinXPpro sp3

 

[ibnsina]

Which version of windows?

 

[lapaj]

WinXP pro SP3

 

[ibnsina]

In Volume Master, go to Options, then Properties, from there
tick Microphone box. Select OK.
………………………………………………………………….
Other option is to right click on speaker icon, next to the time. Select Adjust Audio properties, then Audio tab, then Volume under Sound Recording.

 

[lapaj]

That is my problem. There is missing Microphone, so I have no possibility to show Microphone in Master Volume...
I think Acer has disabled it somwhere in registry.
Thanks for any idea.