System Configuration : I/O Setup : I/O Setup Options : Low Latency Monitoring

Low Latency Monitoring
(HD Native Systems Only)
With HD Native systems, the Output page of the I/O Setup lets you enable (or disable) Low Latency Monitoring. It also lets you specify any available Output path for Low Latency Monitoring. The Output path for Low Latency Monitoring can be of any channel width (from Mono to 7.1). Low Latency Monitoring uses Outputs 1–2 by default.
To configure Low Latency Monitoring in the I/O Setup:
1 Open the I/O Setup dialog (Setup > I/O).
2 Click the Output tab.
3 Enable the Low Latency Monitoring option.
4 From the Low Latency Monitoring pop-up menu, select the Output path you want to use for Low Latency Monitoring.
5 Click OK to save your changes and close the I/O Setup.