• Handles.SetSourceHandleFromHandle
• ActionScript.SetProperty
• Handles.SetLegend
• Handles.ClearSelection

• Handles.SourceHandle (Implicitely used.)
• Handles.PendingLegend

setPlaybackLegend.xml

<?xml version="1.0" encoding="utf-8"?>
<avolites.macros>
 <macro name="Set Chase 10555 legend" id="Macros.SetChaseLegend">
    <description></description>
    <sequence>
      <step>Handles.SetSourceHandleFromHandle("chaseHandleUN=10555")</step>
      <step>ActionScript.SetProperty("Handles.PendingLegend", "Test")</step>
      <step>Handles.SetLegend()</step>
      <step>Handles.ClearSelection()</step>
    </sequence>
  </macro>
</avolites.macros>

This explains the functional steps within the sequence. For all the other XML details please refer to Formats and syntax

This is an example of how to set a playback's legend. (There is another example for setting a playback cue's legend).

• Handles.SetSourceHandleFromHandle(“chaseHandleUN=10555”) selects a specific handle to set its legend.
• ActionScript.SetProperty(“Handles.PendingLegend”, “Test”) sets the general property 'Handles.PendingLegend' to a specific string
• Handles.SetLegend() applies this legend to the previously selected playback
• Handles.ClearSelection() unselects the playback handle.

1. edit to meet your needs (or set a chaser to userNumber 10555) and make this macro available
2. call this macro to set this playback's legend. Most likely you will use this for other purposes.