Hiding Triggers

Good morning! Is it possible to create a widget that can be hidden and triggered when touched? For instance, in a drawing of a farm with a tractor, a horse and chickens, I want to be able to trigger their different sounds when touched. Is there a succinct way to hide triggers underneath them for appropriate sounds? Right now I have an object hidden under the tractor but it seems that when it's hidden, touch commands do not affect it.
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