@Override
    public float getPlaybackTime() {
        if (channel >= 0)
            return getRenderer().getSourcePlaybackTime(this);
        else
            return 0;
    }
Set the time offset in the sound sample when to start playing.

@param timeOffset The time offset
@throws IllegalArgumentException If timeOffset is negative
jme3-core/src/main/java/com/jme3/audio/AudioNode.java