public void setVelocity(Vector3f velocity) {
        this.velocity.set(velocity);
        updateListenerParam(ListenerParam.Velocity);
    }
Sets the velocity of the listener.
This is used for Doppler effect calculations.
If an {@link AudioRenderer} is set, it will be notified of the velocity change.

@param velocity The new velocity of the listener.
jme3-core/src/main/java/com/jme3/audio/Listener.java