Tuner doesn't work very well

I am testing the tuner code, and i apply a constant note(sound) to microphone, and never give me the same note.

Have anyone faced this problem making an app? [import]uid: 113117 topic_id: 26926 reply_id: 326926[/import]

up [import]uid: 113117 topic_id: 26926 reply_id: 109429[/import]