How do I change Z-breathe setting on my Z1/Z2?

To change the Z-Breathe setting on your device, start with the unit in standby mode (reading 0.0 for the pressure). Simultaneously hold down the UP and DOWN arrow buttons until APAP or CPAP-2 is flashing.  Use the UP and DOWN arrow buttons to adjust the setting and hold down the MIDDLE power button until you see the word ACCEPT on your screen. The unit will then return to standby mode.