This trophy is just a multiple of a previous trophy:
White Noise will begin to appear, if I remember correctly, during the first class trial (if you're on Kind or Mean difficulty, as they will not appear during Gentle). Use the PS Vita's back touchscreen to clear the white noise away without having to worry about hitting the arguments and losing time. If you play the last trial on the Mean difficulty, the amount of white noise is ridiculous and you would, in fact, be able to clear this rather fast after your first play through.