Using the sensitivity input gain setting with +/- 10DB, you can set your input so that the VU meter goes up to the orange level, but never up to clip level (audio cut off and saturation). Generally, it’s recommended that input signal connected to device is of the highest possible level without saturating input converters. If the input is saturated (VU meter goes up to the red level), you should attenuate the level to obtain the best signal without saturation.