There is no microphone in the game. However, there is a microphone on your DS. For the DS Lite, the Mic is in the middle of the hinge between the two screens, on a DS (regular) it is on the right side of the hinge.
you fix it
Yes, there is.
the ds has a built in microphone, to allow the games to incorporate blowing, speech and other actions which cause sound into the games.
To repair the microphone on a Nintendo DS Lite you should send the unit to an authorized repair center or technician.
you have to have it customed
You inhale air and let the air out toward the microphone (which is at the center of the DS lite and around the bottom on the regular DS)
The Nintendo DS Lite microphone is used for voice recognition. I have never owned a DS so I am not that familiar with the unit. I have seen some of the children at church us it. That has been my only experience with it.
Something's probably blocking your microphone. When I had this problem on my DS Lite, the microphone itself was broken.
this link will show how to strip the console down! http://www.console-central.com/index.php?option=com_content&task=view&id=3671&Itemid=1
A microphone jack.
Its in the center of your DS between the two screens. Just talk or blow into the center when the game tells you to and it should work. If not, go to the DS options and figure out were u need to go to recalibrate your microphone.