YOU ARE NOT DOING THIS CORRECTLY. THERE SHOULD BE A STEADY TONE (NOT MODULATED IN AMPLLITUDE) WHEN LISENING TO ONE CHANNEL ONLY THROUGH HEAPHONES. YOU ARE MODULATING BOTH CHANNELS IN AMPLITUDE WHICH IS A TOTALLY DIFFERNT EFFECT AND MODALITY.
Right! The left and right frequencies in this video are completely separated, not mixed together. If you're hearing acoustic beats out of one earpiece, you might want to check your device. Disable any processing, enhancers, filters, etc.
Mike Petroff