question: @ Override public void populateFrame ( Audio a ) { if ( ! ( a instanceof AudioListener ) ) { throw new IllegalArgumentException ( a . getSystemName ( ) + " is not an AudioListener object" ) ; } super . populateFrame ( a ) ; AudioListener l = ( AudioListener ) a ; position . setValue ( l . getPosition ( ) ) ; velocity . setValue ( l . getVelocity ( ) ) ; oriAt . setValue ( l . getOrientation ( Audio . AT ) ) ; oriUp . setValue ( l . getOrientation ( Audio . UP ) ) ; gain . setValue ( l . getGain ( ) ) ; metersPerUnit . setValue ( l . getMetersPerUnit ( ) ) ; }
target:  Method to populate the Edit Listener frame with current values