If you’re hearing a lot of “noise” or “waterfall effect” behind the voice of the person, Click on SuperCharge in the Tuning screen during your call. Slide the leftmost part (the “Richness” section) of your Hearing Curve down. If that doesn’t help enough, carefully move a little bit to the right of that part of the curve and slide it down as well. You should be able to hear the other person’s voice come through more clearly. To make it even sharper if necessary, raise the part of the curve in the “Clarity” section up!