Trapcode Sound Keys
Scale will scale all the bars in the spectrum uniformly.
Q (smoothness) defines the wideness of the frequency response of the bars. A high setting will make the spectrum curve smooth and a low setting will make it more "jagged".
Sub Base provides scaling for the very low frequency bars (red).
Base provides scaling for the low frequency bars (red-orange).
Mid provides scaling for the mid frequency bars (green).
Treble provides scaling for the high frequency bars (blue).