Generates a sine wave of given frequency as audio stream.

Amplitude of for panning in stereo can be found using these
panValue can range from -1(left) to +1(right)

• normBalance = ( panValue + 1.f ) * 0.5f;


• leftAmp = (float)Math.cos( PI / 2 * normBalance );


• rightAmp = (float)Math.sin( PI / 2 * normBalance );