Approach to game music development in this time period usually involved using simple tone generation and/or frequency modulation synthesis to simulate instruments for melodies, and use of a "noise channel" for simulating percussive noises. Early use of PCM samples in this era was limited to short sound bites ("Monopoly"), or as an alternate for percussion sounds ("Super Mario Bros. 3"). The music on home consoles often had to share the available channels with other sound effects. For example, if a laser beam was fired by a spaceship, and the laser used a 1400 Hz square wave, then the square wave channel that was in use by music would stop playing music and start playing the sound effect.