Audio Source option in Developer option in Android M

Question

I have recently updated to Android Marshmallow. In developer options, I found a new option "Select USB configuration" having sub options like

• Charging Only
• MTP
• PTP
• RNDIS (USB Ethernet)
• Audio Source
• MIDI

I have used the first three options "Charging only", MTP and PTP. But how does the last 3 options work?

I tried with "Audio Source", and I think this option is intended to use your phone as USB host for audio sourcing, but still I am not able to figure out how it will work?

Answer 1

• Audio source allows your phone's audio output to be routed as a mic input into your computer.
• MIDI will allow your phone to act as a midi device and give midi instructions to your computer. You will need to use midi supported apps to make it work. Something like this