System Configuration : I/O Setup : I/O Setup Pages : Opening an I/O Setup Page

Opening an I/O Setup Page
To open an I/O Setup page:
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Hold the Command key (Mac) or the Control key (Windows) and use the Left or Right Arrow keys to cycle through the different pages of the I/O Setup.
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It is recommended that if you choose to customize your I/O Setup, configure the system-specific options first: Input, Output, Insert, Mic Preamps, and H/W Insert Delay. Then configure the Bus page. Once you have configured your system, you should not need to change it unless you add or remove hardware (such as audio interfaces) from your system. See Customizing I/O Settings.