I have an otari mtr-12II 1/2" 4 track, biased for 996 mastering tape (I forget the tape maker). I want to use some new quantegy 456 tape on the machine. So my question is, what, specifically, will happen to the sound quality if I don't adjust for the bias differences? Will I lose some end of the frequency spectrum? Will is compress/distort badly? Thanks yall....