[b]Check automatically succeeded, considering Boom's race.[/b]

It's literally child's play to decipher the text on the instruments. They appear to be directions, written in the Kokiri's utilitarian grammar. 

On the horn is the sentence [i]"Blow for big loud greeting!"[/i]

On the shell is the sentence [i]"Blow for small quiet greeting!"[/i]

Evidently, blowing the horn will cause the Kokiri to announce themselves to you and greet you bombastically, while blowing the shell will cause the Kokiri to be more subtle in greeting you. [i]Knowing the Kokiri, both of these "greetings" aren't anything good. However, it doesn't seem that there's any better options available.

Which horn do you blow?[/i]