Turning a robots head toward your voice

Just as the amazon echo has an led ring that points to the source of your voice, i would like to drive a stepper motor that turns the robots head.

As this would require a far field microphone array, the matrix creator seems to be possible for this. However, I need to get the signal from the matrix creator that specifies which LED is to be lit and translate that to a stepper motor. The motor would need to be mounted to the matrix board so that the world coordinates are consistent. Otherwise the motor position and the led direction have to sync’ed first