This game I was playing with No$GBA says that I need to talk into the mic at this one part I was at. Anyway to do it with this or am I just not gonna be able to go any further in this game and does the ds really come with a mic? I never noticed.
Yes the DS does come with a mic.
As such you also need a mic/headset when playing the game on an emu. Although voice recognition is not yet good enough to play some games like Nintendogs for instance.
Occasionaly if it's just to blow something away or make a blowing noise you can use a program called Audacity to rerout whatever music your are hearing to audio in, thus giving the same effect as blowing, but the exact details of that method were lost when the thread describing it was deleted and I never needed it as I have a headset.