Yeah mate, it's clear it's just not a priority for them. I too would love better sound but it looks like it's not going to happen. I'm sure you know, DVDfab is Chinese, in Chinese/East Asian culture you never really say things like a direct "no", but you say "we'll look into it", but the meaning of that is that they won't do it most likely.
0tr
And you know so many Chinese people that you have come to this decision? What you are saying is Chinese people won't give you a straight answer. Well you are wrong. This software is a work of art, it takes many people many hours of developing software to give you what you have. You must like it or you would not have bought it. The size of the Fab programs has grown and so has the number of developers If it's possible to do what you ask, they will do it when they are ready, and when it's done correctly.  Be patient, yes over a year patient. Some things are just not a priority as others.