are you using an emulator or a flashcart? if its an emulator, either ur sol, or maybe that guys suggestion works, idk. Best option: Don't be cheap, buy a damn flashcart, or even better, buy the real game.
If its a flashcart, then either it sucks, or your microphone is just plain broken, cuz it should work.
Normally i have good spelling, but right now i just don't care, i apologize.