The correct pronunciation of the word appears on the screen. The children then say the word into a microphone hooked up to the computer. Their pronunciation appears on the screen. The children compare the two patterns and work to make them the same. Many deaf children like the independence the computer gives them.
Most hearing aids make everything louder.
In a setting with a lot of background noise, like a playroom or a party, turning up the volume on all sounds is not helpful. The person wearing the hearing aid will have a hard time sorting out the sounds and their meanings. Many deaf people can hear some sounds, such as low tones, fairly well. But the hearing aid makes these sounds louder for them, too, which can be painful. What a person with a hearing loss is able to hear can depend on the other noises in a room.