Umnn...
I'm sure that I don't know much about Dosbox.conf but I think that I have tried a lot of it. (I have tried to change graphic engine, sound, CPU.... but not all of them.)
I still need somebody to help me more about DosBox.conf..... so please if you can.
However, I don't mind about playing in CGA mode (Hey... It's not that bad).
Perhaps, I have to re-download it again, hoping that I can fix this.