I've used GAP, but I do't know much about plug-ins. I've just read the files as they are, and for some reason, some game files (SQ6 and KQ7, for example) are a lot grainier than others and very few are very clear. I'm afraid I can't really help you, but tell me: is SQ6 any clearer than SQ4 or is it so gritty that you can hardly hear the voices?
Akril