
To start recording, click the Record button in the toolbar or press the R key on your keyboard.Click the Record Enable button in the track header for each track you want to record onto.In GarageBand, assign channel 1 to one track and channel 2 to another track. For example, one USB mic might be assigned to channel 1 and another might be assigned to channel 2 in the Aggregate Device in Audio MIDI setup. Make sure each track has its own input source in GarageBand. Repeat the previous two steps for each track you want to record.These numbered channels correspond to the numbered channels in Audio MIDI Setup. Click the input pop-up menu and choose the input source.Make sure to pick the correct format for the mic or instrument you're using. Click the input button to set the channel to mono or stereo.In the Smart Controls pane, click Recording Settings, then set these options:.Select the track header of one of the new tracks, then click the Track button in the Smart Controls pane at the bottom of the window.Option-click any track header, choose Configure Track Header, then select Record Enable to add the record enable button to each track header.Create several new audio tracks in your GarageBand project.Ciick the Input Device pop-up menu, then choose the Aggregate Device.If you want to use multiple headphones, you'll need a splitter or a headphone amplifier to send Garageband audio to those headphones.

GarageBand can only output audio to a single device. Apple may provide or recommend responses as a possible solution based on the information provided every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the.
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Learn more about how to identify Aggregate Device inputs and outputs
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With the new Aggregate Device selected in the sidebar, select the Use checkbox for each device you want to include as a subdevice in the Aggregate Device. The order in which you check the boxes determines the order of the inputs and outputs in applications like Logic Pro and MainStage.A new Aggregate Device appears in the list on the left side of the window.

