As a musician and sound person, I can not hear any octave frequency differennce between your Delta all the way through Gamma frequencies.. Each time you move from each doubling of a frequency; as from .5khz-1.0, 1.0khz-2.0khz, 2.0khz -4.0khz etc.etc.. There should be an octave difference as in moving down a keyboard from middle C up 8 keys to an upper more treble C. I do not hear any differece in your progressions.. they are all the same no matter what frequency pattern I am listening to.