Question 1: What does the narrator tell the policemen about the cry?

Read the following passage and answer the given subquestions.
I asked the policemen to come in. The cry, I said, was my own, in a dream. The old man, I said, was away; he had gone to visit a friend in the country. I took them through the whole house, telling them to search it all, to search well. I led them finally into the old man’s bedroom. As if playing a game with them I asked them to sit down and talk for a while. My easy, quiet manner made the policemen believe my story. So they sat talking with me in a friendly way. But although I answered them in the same way, I soon wished that they would go. My head hurt and there was a strange sound in my ears. I talked more, and faster. The sound became clearer. And still they sat and talked. Suddenly I knew that the sound was not in my ears, it was not just inside my head. At that moment I must have become quite white. I talked still faster and louder. And the sound, too, became louder. It was a quick, low, soft sound, like the sound of a clock heard through a wall, a sound I knew well. Louder it became, and louder. Why did the men not go? Louder, louder. I stood up and walked quickly around the room. I pushed my chair across the floor to make more noise, to cover that terrible sound. I talked even louder. And still the men sat and talked, and smiled. Was it possible that they could not hear? No! They heard! I was certain of it. They knew! Now it was they who were playing a game with me. I was suffering more than I could bear, from their smiles, and from that sound. Louder, louder, louder! Suddenly I could bear it no longer. I pointed at the boards and cried, “Yes! Yes, I killed him. Pull up the boards and you shall see! I killed him. But why does his heart not stop beating?! Why does it not stop!?”
(The Tell Tale Heart ~ Edgar Allen Poe)

What does the narrator tell the policemen about the cry?