Lens for cat/dog -> trigger/behavior problem

Hello everybody, 

I'm a new user of Lens Studio and I'm trying do create a Lens for animals. 

I would like to play a sound as soon as the animal face is found. 

But the only thing I managed to do is to set an "on tap" trigger to start playing my sound. 

I also tried the "on awake" and the "on start" triggers but the sound is played before the cute animal face is found :( . 

So it seems like the "on tap" trigger is the only way to play my sound after the face is found.

Hope I'm wrong.

Can you help me please ?

Many thanks.