yeah they are set frequencies. One day I should compare it to my analog EQ and figure out what freq is being controlled or maby there is an easier way.
if I cant EQ it the way i want with the eq function then I try useing EQ and/ or the isolator.
I just mix my stuff with the isolator and then if there's something I want to fix I'll just compress the sound then eq it with a 30 band eq in the computer on some later date.
I think a good explanation of the difference between the Equalizer and the Isolator would be: the Equalizer adjusts the volume of the frequencies, and the Isolator adjusts the presence of the frequencies. That may sound kinda vague, but uh... I think it makes sense.
And yeah, combining both correctly is a great way to fine-tune your samples.
I'd be willing to bet that the [ISOLATOR] also effects the freqs in more of a 'block' style. Moving big chunks, with a really steep curve. Whereas the [EQ] effects the freq spectrum with more of a slope that accelerates as you turn the knobs.