public static float smooth(float prevValue, float newValue, float a) {
		return a * newValue + (1 - a) * prevValue;
	}
Exponential smoothing (Holt - Winters).
@param prevValue previous values in series <code>X[i-1]</code>
@param newValue new value in series <code>X[i]</code>
@param a smooth coefficient
@return smoothed value
library/src/main/java/com/cleveroad/audiovisualization/Utils.java