XP
[autoit]
#include <GuiSlider.au3>
Run(@SystemDir & "\SndVol32.exe", "", @SW_HIDE)
WinWait("Lautstärkeregelung")
$handel = ControlGetHandle("Lautstärkeregelung", "", "[CLASS:msctls_trackbar32; INSTANCE:1]")
$Pos = _GUICtrlSlider_GetPos($handel)
WinClose("Lautstärkeregelung")
MsgBox(0, "Lautstärke", $Pos)