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The solution is on the DJM-2000NXS FAQs:
When inputting audio from DJM-2000NXS, the following setting is required.
1. Input/output setting for DJM-2000NXS
2. For Mac, creation of Audio MIDI Aggregate Device
Please switch the setting as follows when DJM-2000NXS is connected to your computer with the USB cable.
1.Input/output setting for DJM-2000NXS (Win/Mac)
Step1. Open [Preferences] > [Audio] > [Audio] and confirm the setting is as follows:
For Windows: [PIONEER DJM-2000 ASIO]
For Mac: [DJM-2000 output]
Step2. Open [Preferences] > [Audio] > [Input channels] and click [Setting Utility]
Step3. Switch [Input/Output] at [DJM-2000 Setting Utility] depending on your computer’s operating system (OS) as follows:
For Windows: ASIO 3 outputs 1 input 16 bits DirectX 1 output 1 input
For Mac: 6-channel output 2-channel input 16 bits
Note: When the input/output setting is switched as described above, CH4 of DJM-2000NXS cannot be used for output.
2.Creation of Audio MIDI Aggregate Device (For Mac)
Step1. From the Finder, open [Application] > [Utility] and click [Audio MIDI Setting].
Step2. Click the [+] button at the left bottom in the [Audio Devices] window and select [Create Aggregate Device].
Step3. Tick the checkbox of [DJM-2000] and [DJM-2000 output].
Step4. Change the name from [Aggregate Device] to [DJM-2000_input/output]. Enter the name exactly as is.(Caution: the device will not work if the name is entered differently).
Step5. Open [Preferences] > [Audio] > [Audio] and select [DJM-2000_input/output].
