Weeding out is simply eliminating those tone combinations which don't have a whole lot of effect for me or that I don't like. For me it is almost all subjective.
Weeding out might better have been expressed as "tuning in." I sweep the carrier frequency until I feel something, then expand the beat frequency. Add another beat pair and keep going until it feels full.
I usually strive to utilize the western musical scale as a basis for things. A=440 doesn't drive musicians with perfect pitch nuts. 100 or 200 Hz don't fit into the diatonic system yet some mind travel systems use those frequency increments.
