Hey Robin,
From my usage of MATLAB Mobile, I can see that it recognizes individual internal microphones on the device, as well as external peripherals. I was able to record audio from my bluetooth headset using "mobiledev" function.
I followed the below example,
You can select the microphone of your choice from the MATLAB Mobile app by navigating to Sensors > Sampling Parameters > Microphone, and selecting from the list of available microphones. You can even do this programmatically by running,
m.SelectedMicrophone = m.AvailableMicrophones{1} % Change the index according to the list of available mics
If other apps on your Android device can recognize your USB mic, then so should MATLAB.
I hope this helps!
