Message Scroll Mode allows the Preset to scroll through each of the 16 Messages in the Preset.
For example, if you have Msg 1, 2 and 3 programmed with a RELEASE action and Preset Message Scroll mode is ON, on first RELEASE, only Msg 1 will be executed. On the next RELEASE, Msg 2 will be executed. On the next RELEASE, Msg 3 will be executed. It will then loop back to Msg 1.