AVI Normalize and MP3Gain programming?

[Kimagure-No-Ken]

AVI Normalize at http://www.vidomi.com/download.php?op=geninfo&did=19 is 3 utilities which extracts the mp3 from avi file(s) and then normalizes the mp3 in MP3Gain at http://mp3gain.sourceforge.net/ last combine avi with the new mp3-file using NanDub. It's all done by executing a bat-file.

Now here is the problem :/ ! MP3Gain(Dos-version, command-line back end) can not Normalize to a specified level(dB of max volume) so it is automated and can still become clip in mp3-audio. I've tried all dos-commandos available in mp3gain.exe but no success.
MP3Gain has a GUI called MP3GainGUI.exe, it normalizes mp3 at a desired dB, so it has more functions.

Here is my question:

Does anyone know how to edit the bat-file so the MP3Gain GUI handles the mp3 instead of MP3Gain DOS?

I've tried to replace mp3gain.exe with MP3GainGUI.exe in bat-file, and when I execute the bat-file it opens the mp3-file in MP3Gain GUI but doesn't normalize it.

The source-code for MP3Gain GUI is at the author's website.

Anyone with programming knowledge(Visual Basic and C++) and script macro commands (bat-file)!

Please Help?!

[Baldrick]

Please don't cross post. One topic is enough.