Windows
Open up your system sound settings. To do so, right-click the speaker icon in your taskbar and select "Sound settings." Select ProFX 3-4 as your default sound device. Your computer will now output its audio to the 3-4 return as a standard channel. Engage the USB 3-4 button on your last channel to assign it to the channel strip.
macOS
Open up Audio MIDI Setup. To do so, open Spotlight Search (Cmd+Spacebar) and search for it. Under the ProFX device in the Output tab, click “Configure Speakers.” Change the left output to 3 and the right output to 4. Your computer will now output its audio to the 3-4 return as a standard channel. Engage the USB 3-4 button on your last channel to assign it to the channel strip.
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