#27 Add access to microphone

[Reylak]

It would be nice to give access to the microphone of the console. The libnds sure can handle this so it wouldn't be too difficult.

[Papymouge]

I work on it.
For now, i can record 5s of sound in DS memory and play it like a parrot.
The sound:
-- frame rate: 8000
-- format: 12bits shifted up 16bits.