@Override
    public void write(JmeExporter ex) throws IOException {
        super.write(ex);
        OutputCapsule oc = ex.getCapsule(this);
        oc.write(stream, "do_stream", false);
        oc.write(streamCache, "use_stream_cache", false);
    }
Specifies if the stream cache is used.

When enabled, the audio stream will
be read entirely but not decoded, allowing features such as
seeking, looping and determining duration.

@return true if stream cache is in use, otherwise false
jme3-core/src/main/java/com/jme3/audio/AudioKey.java