Target "Project: Any on (solo/mute/…)"
This target is most useful in feedback direction.
Map it to some LED on your controller. Depending on your target settings, the LED will light up, for example …
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… when at least one of the tracks in your project is mute
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… when at least one MIDI editor is focused
If the control element is a button, pressing the button will e.g. unmute all tracks in your project.