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10.3.3.7 Gain Factor Figure 100: Gain Factor Gain Factor defines how much gain is applied to the group slots. Many harmonic tonal noises have a “1/f” volume profile, where the lower harmonics are strong and higher harmonics are progressively weaker. The Gain Factor controls the gain taper of the slots so that the slot gain can parallel the harmonic strength profile. The base slot always has the specified Slot Gain, while subsequent slots taper to smaller gains as frequency increases. The higher the Gain Factor, the more gradual the taper. A Gain Factor of 0.0 produces the most severe taper and means effectively that there are no harmonics at all. A Gain Factor of 1.0 means that slots have uniform gain at the Base Slot gain setting. 10.3.3.8 Upper Limit Figure 101: Upper Limit Upper Limit defines how many slots there are in the group. If a harmonic tonal noise only extends up to a certain frequency, it may be undesirable to slot out all multiples of the base frequency when only a few are needed. In this case, set the Upper Limit just above the highest frequency where a slot is desired; slots will be added up to that limit, and no slots will be added above the limit. 10.3.3.9 Add Slot Figure 102: Add Slot Button Adds a new single slot at the frequency indicated in the Slot Frequency box and by a marker on the visualization axis. The slot is added with default settings, and the user is presented with controls to adjust the frequency, width, and gain of the slot. 10.3.3.10 Add Group 77