Correct me if I'm wrong, but if the L freq is 144 Hz and the R freq is 145.1 Hz, then wouldn't the perceived interaural phase frequency be 1.1 Hz, and not 0.5 Hz?
(Tension is calculated as the difference between two frequencies, i.e. 145.1 - 144 = 1.1)
One of the operator tone frequencies is incorrect.
They're not hard-panned (L/R 100%), so it's not an ideal mix, but it still works.