When small frequency when there is no sound

[waterworms]

var A0:Number =27.50;
var baseSound1:IAudioSource = new SoundSource(Sounds_s1,new AudioDescriptor());
var C4Note:IAudioSource = new new ResamplingFilter(baseSound1,A0);
var keyboardPlayer:AudioPlayer = new AudioPlayer();
keyboardPlayer.play(C4Note);

When small frequency when there is no sound