I don't know if this has been publically posted yet or not, perhpas it has and perhaps all of you have already read it, but here is a recent comment by the main developper of ConvertXtoDVD:
"Sound source (especially on MP3) is a real nightmare, as the source can go to barely understandable to incredibly loud.
It's not a problem in ConvertX in fact. The encoder can take the whole dynamic of AC-3, so if the source is very loud, it'll be encoded very loud. On our reference equipment it doesn't saturate or distord, but the problem is that most audio equipment is not able to support such a loudness, thus result in audio distorsion because of poor AC-3 decoder. Also Computer sound players often handle the situation simply by dividing the output signal by 2 - thus distorsion is not to be ear even if the source is massively loud.
And the sound compressor make things even worse in such case. That's why this setting is off by default.
There's not a lot of solution. I've added a detection of loud MP3 sources (only on MP3 so far), to limit the problem, but as long as the source will be too loud, the resulting AC-3 will be loud as well.
I set this bug (bug 664) as fixed, but I'm sure there will be other samples from other sources that may complain of being too loud..."
Change log :http://www.vso-software.fr/products/convert_x_to_dvd/history.php
so if you want to upload a file to VSO for them to test with you can, a file where the "static" is amplified would be a good test file for VSO have. For more information you can contact claire @ vso-software.fr (without spaces)