Gnaural

lately i've been trying to have an OBE with the help of binaual beats by using the free program of gnaural. i wanna know (for those of you who have used gnaural) what is the best frequency for the beats to be played at and what's the best beat tone to use to acheive an OBE?

Most binaurals start at a higher frequency (like 15Hz) (not beat frequency, but differential, aka tone) and slowly go down to 4Hz. The base frequencies should be in the audible range, whatever that is.