I don't know if this is the most amazing or the most pointless thing I've ever done.
It's quite cool. However, you're lying about the internet. You're using sound to send the data. Either way, pretty amazing. You could probably tweak the times, however, as I notice that the command take about 5 seconds to run. You could probably use 0.5 seconds of certain frequencies to control the 3DS, which would cause less input lag.
I'm not lying, I am sending the message over the internet. By your logic, it's lying saying I'm sending this message to you over the internet since the message is first sent through the internet, but then hits a router which then transfers it to you using--not the internet, but--radio waves! Just replace radio waves with sound and that's what you get.
In fact, if you go back not long ago, most people were receiving internet messages through sound waves.
The word "internet" is short for "inter-network", being a network of networks. As long as your device is capable of sending and receiving data with other networks on the internet, then it is part of the inter-network, thus part of the internet. The phone and 3DS are sort of both a single unit of the internet, they both send and receive requests from the same IP, but there's no reason to say the phone or 3DS is more "truly part of the internet" than the other. If I could connect more devices up, I could even have the phone serve unique addresses for the devices connected to it.
Honestly, saying I was lying about that was a bit absurd. Even if I was mistaken, calling me a liar is not very pleasant behavior.
It is true it is very slow. I'm not very knowledgeable on how to interpret sound data. Do you have an idea on how I would go about doing this, or a resource where I could learn how to do this?
