Some may wonder why you’d want to convert audio to MIDI, and this is a valid concern. The short answer is that MIDI allows you to alter data in ways that are difficult or impossible with audio. You can, for example, transpose MIDI to any key, adjust the tempo, and quantize it.
You may have a guitar loop that would sound great doubled on a synthesizer, but you lack the necessary theory and technique to perform it. You may use it to trigger the same line on your virtual synth by setting it to MIDI. Similarly, by translating your voice to MIDI, you can sing or hum to play virtual instruments.
You may incorporate audio to MIDI into your live performance or studio sessions in a variety of ways. Dodo MIDI isn’t the first audio-to-MIDI converter, but it claims to be the finest so far.
There are probably a couple of different techniques to convert audio to MIDI in whichever DAW you’re using. There are a few possibilities in Logic Pro X depending on your source, with Flex Pitch being the most common. While Flex Pitch is important, it is far from ideal.
There are more expensive alternatives, such as Melodyne, which isn’t perfect. A setup utilizing the Waves OVox MIDI Out function works best for live performances rather than studio use. For live use, there’s also Vochlea’s entertaining but overpriced Dubler 2.