Dodo MIDI is a free speech-to-MIDI plugin that detects incoming audio, which may be spoken or musical instruments, and converts it to MIDI, which can then be used to control any MIDI synth.
What the developer has to say about it is as follows:
“What distinguishes it from all other audio to MIDI software products on the market is that it performs very well and is helpful as a live musical instrument!” For the first time, you can play (nearly) any synthesizer or sampler using your voice, with no latency and extremely exact control over legato, slides, and articulation.”
The video above shows how to get started with the plugin. The video below shows how to configure it to operate a MIDI instrument:
Download it Dodo MIDI for free
You can download the Mac and Windows version directly in there website https://dodobirdmusic.com/dodo-midi/