I wanted to use the 3ds microphone to the pc just for a joke and i can't seem to find anything on this, I've only found stuff about recording the game audio to the PC
Definitely drop it if you ever remember o7. I was trying to make my own homebrew for the 3ds before I found that video and just gave up because I'm a huge noob at C and couldn't manage the audio buffers correctly.I remember a few years ago someone actually made a homebrew that did exactly this for the Nintendo DS, it should probably work on the DSi/3DS as well.
The problem is that I don't remember what the homebrew was called, I just know it exists.