Mac: make an aggregated audio device (group 2 or more audio devices into one)

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also see this article from Apple: Combine multiple audio interfaces by creating an Aggregate Device

ATTN: this is for Mac only !

You may want to do this especially since on most Macs the audio output device (usually called "Built-in Output") and the audio input device - the microphone (usually called "Built-in Microphone") are separated devices, so you cannot use them at the same time in / FutureDecks DJ pro. So, you have to make an aggregate device from the 2 devices to be able to use both output and input (microphone) at the same time.

If you wish to aggregate 2 or more audio devices (make them into one) so they would appear as one single audio device here is what you have to do:

Step 1 - open a Finder window and go to Applications -> Utilities and start Audio MIDI Setup
Step 2 - if the Audio Devices window is not already opened you need to go to the Menu -> Window -> Show Audio Devices
Step 3 - on the bottom-left corner there is a + (plus) button you need to press and then select "Create Aggregate Device"
Step 4 - a new "Aggregate Device" appears in the devices list -- simply select it and then enable (on the right) the "Built-in Microphone" and "Built-in Output" devices. After you checked (enabled) both the input and the output devices you then select the Clock Source as the "Built-in Output" device

That's all there is to it. You now simply open up / FutureDecks DJ pro and select the "Aggregate Device" in the Audio settings.