Sentence:  Interestingly enough - although none of the real-life therapists involved could conceivably compare with Blauberman - when groups of them began playing back interviews , they discovered any number of ways in which they wanted to polish their own interview techniques ; almost everyone , on first <WSD>hearing</WSD> one of his own sessions on tape , expressed some desire to take the whole thing over again . 
Meaning of the word marked with <WSD> tags:  perceive (sound) via the auditory sense