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The Macro option is used to specify which macro (EOS & grandMA 2) will trigger the script. The option will only have an effect if the TriggerType is set to EOS_Macro or MA2_Macro.
If you are connected to the console via OSC for the EOS family of consoles, or Telnet for the grandMA 2, running the macro number specified will trigger the script to run within Moving Light Assistant. For example, this could be a useful way to trigger Moving Light Assistant to take a Preset photo from the console.