I use dvd shrink to re-author and only play main movie. In the audio section, I see files that are checked that use alot of MB. AC3 5.1-ch English, DTS 5.1-ch English, AC3 2-ch English, French, Spanish. I know I can uncheck French and Spanish, but what can i uncheck in the engish to increase the %quality. I don't know what the acroynms mean(AC3 5.1,DTS 5.1,AC3 2) Do I have to leave all the English checked or can I uncheck 1 or more of english?