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        <multimedia:sound3D>.velocity
        
        Sets the velocity of the sound for doppler effects
        
            
                
                    | <multimedia:sound3D>.velocity() |  | 
            
         
        Remarks
        This command simulates a dopper effect. A velocity vector pointing toward the viewpoint increases the sound frequency.  If the velocity vector is pointing away, the frequency decreases.
        Return Value
        None
        Example
        
            ball = viz.add('ball.wrl')
sound = ball.playsound('arrgh.wav',viz.LOOP)
sound.velocity( ball.getVelocity() )