What is the toy / midi instrument where you can sing into it and it converts your voice into the music pleasant?

I've seen a DVD with Richard Bandler using one. You also can hum it. Turn the tone of his voice into MIDI. It also makes some matching step to make your music sound more harmonious. There is a paragon of any kind. His voice becomes another instrument via MIDI.

You can refer to a sampler. Record any sound is coming and you can play a song with the sound pattern.

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