Cipher

So we'd need the speakers right?
But how do we use it or what would we use it for?

i now got what you meant by the keys,
but i still dont understand the part about being in America...

it says i did get the idea,
but what number should it be?
Am i looking at the wrong photo or is the answer in the photo itself?

EDIT: HAHAHA nevermind! i found the answer~ LOL you're so smart )