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Setting remote control codes for the remote control
To set the remote control codes to AMP1, AMP2 or AMP3
Hold down 
and one of the number 1, 2 or 3 buttons for more than 5 seconds.
and one of the number 1, 2 or 3 buttons for more than 5 seconds.Set the remote control code to AMP1, AMP2 or AMP3 according to the selected number button.
NOTE
The remote control codes returns to the default settings when the batteries are removed. Set the remote control codes again after replacing the batteries.