Sources of sources – noises such as fish tanks, small indoor waterfalls or fountains, fans or low volume music can provide a steady background of comforting noise that can be useful at night or in a quiet environment.
Vyanzo vya vyanzo – noises kama vile mizinga samaki, waterfalls ndogo au chemchemi ya ndani, mashabiki au kiasi cha chini muziki inaweza kutoa background kutosha wa kelele faraja ambayo inaweza kuwa na manufaa wakati wa usiku au katika mazingira ya utulivu.