looking at isochronic isotonic frequencies specifically in Theta waves, between 4-8 Hertz.
this is the tempo of one hand tapping quickly, similar to American Indian drums pounding, or the dissonance vibration or beating between two notes, frequencies or interval, and also a vibrato ot tremolo effect pedal.
the conclusion between Isochronic Tones vs Hemi-Sync, is Isochronic is far superior in all ways.
meaning a simple vibrato on keyboards or guitar does exactly what these high-tech trance videos do.
Theta is the brain state documented in the most advanced meditation masters.
wo wo wo.. at the tempo of your hand quickly tapping your leg.
it also reminds me of giants gongs self resonate beating.