When you have control of Ecco and can pause, Try to pause while Ecco is facing you. Once Ecco is facing you, press A, B, C, B, C, A, C, A, and B. If you entered the code correctly, a menu will pop up with all sorts of optionssuch as a sound test, level select, tempo, etc. This code can be entered as many times as you'd like, as long as the game is paused while Ecco is facing you.