Edit - See post #10 for new script After a night of study about MCI, I'm pleased to release a much needed code. Better late than never! ; MCI Stereo Level Meter v0.0.3 ; Released: November 06, 2010 ; AutoIt3 v3.3.6 ; Reference: "http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/htm/_win32_recording.asp" Opt('GUIOnEventMode', 1) Local $ui = GUICreate('Stereo Level Meter', 200, 100, -1, -1, Default, 0x00000008 + 0x00000200) Local $ProgressBarL = GUICtrlCreateProgress(85,