/** Frees all system resources, which are bounded to this object. */ @Override public void close() { super.close(); if (filter1 != null) { filter1.close(); } filter1 = null; if (filter2 != null) { filter2.close(); } filter2 = null; if (equalizer != null) { equalizer.close(); } equalizer = null; if (spline != null) { spline.close(); } spline = null; }