Audio Panning using DirectX

Audio Panning using DirectX

I'm creating a video player that plays on two external screens. For the
two screens there is a button for the left and right screen. For each
screen I want to pan the audio to the left and to the right respectively.
I've added this into my btnRightPlay, however the audio still does not
play on the right channel only. Does anyone have an advice on this? Do I
need to add a buffer?
Pan.Right.Equals(10000);