There are 2 ways to change presets.
The first way is to open up the software application and select 1 of the four presets here:
Or, the easier way is to use the optional ACR-3 dash remote:
To recall a memory preset with the ACR-3, press the knob in to switch from BLUE mode (volume control) to the RED mode (preset recall). While the red LED is on, turn the knob either clockwise or counter-clockwise to change the preset. The red LED will blink to indicate the preset has been changed. For example, if you are on Preset 1 and want to select Preset 3, turn the knob clockwise 2 clicks, the red LED will blink 3 times to indicate Preset 3 has been selected. One click will move the preset forward or backward 1 spot, 2 clicks will move it 2 spots, etc…
There is no ‘wrapping’ to the knob, that is, turning the knob clockwise from preset 4 will only recall preset 4. It will not wrap around back to preset 1.