Connect your phone to your computer, open your favorite daw and hum notes.
Setting up VIDI:
1. Connect your iPhone or iPad to your Mac.
2. Go to Applications on your Mac, and open "Audio MIDI Setup".
3. Find your iPhone or iPad under "Devices" and click Activate.
4. Open your DAW of choice, like Ableton or Logic and create a new MIDI track.
5. Open VIDI on your iPhone or iPad
6. Hum notes into the App and start controlling MIDI in your DAW.