I'm not an Eclipse owner; just general knowledge that I apply to the Pitchfactor, Whammy, and other pitch shifters:
100 cents to a semitone. 1200 cents to an octave. So, -1200 cents would be an octave down from the source. A minor third up = +300 cents; a major third up = +400 cents; a fifth down would be – 700 cents, and so on. It's a fine increment of measure for pitch, and it's useful in detuning. +25c and -25c of detuning gives you a 'spread' of a quarter-tone [50 cents]. It's important to remember that cents are added / subtracted.
When dealing with intervals, pitch, frequency in Hertz, it's useful to think in ratios. Ratios are multiplied & divided by the original source. An octave above is twice the frequency of the initial pitch, and and octave below is one-half of the frequency. My H910/H949 diagrams have the ratios in a 'dot matrix' font; inline with MIDI Note numbers and intervals from middle C. But you can find charts and explanations of the same by Googling 'pitch ratios'. or 'cents vs. ratios'.
