Yak Wakky
The Yak Wakky allowed users to change the pitch and speed of the recording by way of light sensitive sensors on the body of the device. When activated by a switch on the right hand side of the toy, the sensors would, depending on how much light shone on them, increase the pitch of the recording. By using the palm of his/her hand, the user could alter the pitch of the recordings dramatically.
Read more about this topic: Yak Bak