Custom icon:
By default, when you use an icon suggested by Hercules
Stream Control, the action icon is grayed out when an
action is triggered, and the track icon is crossed out
when the track is muted.
You can define icons to be displayed according to the
status of the action or of the track:
− Action not triggered / Track playing: ON status icon;
− Action in progress / Track muted: OFF status icon.
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