Oh...one more thing...
I suppose if you
really read the manual, you'll find this stuff for yourself. But apparently I didn't, because I had to have someone else on this forum point out one of the coolest, completely non-obvious, features of GlissEQ. If you hold the Ctrl key and click and drag across the spectrum display, it will solo a notch of whatever frequency you're at so you can get an audible cue as to the range you might want to be messing with.