HG/SS Microphone Test screen
Posted by: Torchickens
Date: 2010-08-13 16:44:13
Interestingly, it only seems to be accessible on HeartGold/SoulSilver, despite the fact that microphone testing would have been desirable as early as Diamond and Pearl (i.e. voice chat/chatter support).
For this reason I wonder why it exists and whether the button combination has actually been revealed by Nintendo? The screen is very basic and is titled "Mic Test", whilst the bottom screen says "Please say something directly into the Mic." It shows a picture of a Jigglypuff on the top screen, which will sing (if the input is loud enough) and indicate the amplitude of the sound waves.
Edit: Yes it has, on page 11 of the instruction booklet