Siman 606

(163.) For a record — the incident of matai v'lo matai [reaching and not reaching] — when he was dancing and Ch. was playing — and he then felt the presence of Rabbi Shimon bar Yochai. At the time he was in the aspect of matai [reaching] — he did not hear Ch. playing at all. And afterwards when he returned to the aspect of v'lo matai [not reaching] — then he heard a little.