As I recall, your EX,SX and ZX settings are for bias, which is part of the recording function. EX will probably match inexpensive tapes, SX for high quality tapes and ZX for the very expensive "chromium" type tapes. Your EQ settings are for playback with the lower setting for inexpensive tape and the ligher setting for high quality and "chromium" type tapes. Using oth the Bias and EQ settings properly will maximize the performance of the tape you select. (I found that TDK SA worked the best for my applications.)
Merry Christmas to you, too!
Jim
Merry Christmas to you, too!
Jim