Clarify that flush does not necessarily free up buffer space

    /**

     * Flushes the audio data currently queued for playback. Any data that has

     * not been played back will be discarded.  No-op if not stopped or paused,

     * been written but not yet presented will be discarded.  No-op if not stopped or paused,

     * or if the track's creation mode is not {@link #MODE_STREAM}.

     * <BR> Note that although data written but not yet presented is discarded, there is no

     * guarantee that all of the buffer space formerly used by that data

     * is available for a subsequent write.

     * For example, a call to {@link #write(byte[], int, int)} with <code>sizeInBytes</code>

     * less than or equal to the total buffer size

     * may return a short actual transfer count.

     */

    public void flush() {

        if (mState == STATE_INITIALIZED) {