When you are using a multichannel audio interface, you can set up microphone multiplexor to cycle through two or more microphones while you are doing measurements. Note that the mic multiplexor feature is not available in every tool, since only tools that support time-averaging of audio can benefit from a multiplexor.
To set up a microphone multiplexor, or mux, first plug in your multichannel interface, and set up the microphones around the room. Then, navigate to the Settings->Mux function. If you have two or more channels available, you will see the Mux setup screen. Here you can turn on as many channels as you would like to include in the microphone rotation selection, and if desired set a trim offset. Note that this trim offset is applied to the trim on the normal microphone setup page.
For example, plug one microphone into input 1, and navigate to the normal microphone calibration page. Calibrate as usual, and then use the Channel Mapper to select the other microphones, one by one, and calibrate them. Make a note of the trim difference for each microphone, and then you can set that trim for each of the other channels back in the Mux function.
Next, set the amount of time for the complete cycle. For example, if you have 4 microphones selected and a 10s Cycle Time, that will cause each microphone to be active for 2 seconds at a time.
Finally, turn on the Enable switch. Now, when you go to a tool like RTA or FFT that support the Mux feature, it will be active.
The microphone multiplexor is not available with iAudioInterface2.
Note: Coming soon in AudioTools v16.3