In one part of the Sonata, Imre forgot to remove the mute. – The violin sounded fainter and fainter and fainter – and still he didn’t notice anything; there was a fermata during which he could have removed the thing, but he didn’t – and he was getting dangerously near to an f, in fact an ff. My God, I wondered, what’s going to happen here! And at last I had to shout at him: ‘Take off your mute!’