thanks for advice, I am working with a friend programmer on it, and I have asked THE Lurker as well. the latter says he doesn't have the source code and recommends using the recent FW's which I don't want. My DX90 has already been tampered with, it is the famous MM2 made by Sanmigel, this mode doesn't have a line out, it was removed for the sake of better SQ. But, the recent FW's sound pretty equal in both ears. It makes me think it's the FW's issue maybe even a side effect due because of the huge stereo. nevertheless, I am still interested to know what parameter/line is responsible for the balance of channels, for SQ, etc.
Another thing that I want to know if the DX90 really has a weak bass. I've seen people comments on how bassy it is which just doesn't add up. the bass becomes even more light with the recent FW versions being another reason I stick with FW 2.0 for its better bass (yet not perfect though). Any comments on this as well? thanks