How to tell if a unit is 'talking'?

[Orphea]

I set a voiceline as indicator for invalid ability target in the trigger editor. Now whenever the ability order fails a target validation, the sound will be attached to unit. I want it to be played as a usual unit sound -- not overlapping with itself or other voicelines from the same unit. Is that possible?

 

[O_Vazio]

A unit speaks when an order is given to it or when it is selected. The complicated thing in this case would be knowing when it finished talking.

 

[Astral_JG]

Easiest would be just letting them override. Otherwise you'll have to trigger the unit's entire voice lines yourself.