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First, go to System Settings > I/O and set Pedal 1 to “SW 1-3”, then go to calibration to confirm the aux switch works correctly.
Now, go to Global – Pedal Ctl and set Tap Tempo to SW 1.
You should now be able to control the System Tempo using the aux switch. Follow the instructions to turn tempo sync on for Preset A or B, and your effects will sync to the System Tempo.