The main use of Super Histogram is to take a close look at image data and discover what your eyes alone can’t see. The histogram will tell you what the lowest black point is, what the highest white point is and a lot more. If you are worried about clipping colors, smooth gradations and such, having a tool like this is helpful.
A case in point, I have worked on several film projects that dealt with subtle color banding issues, especially in the dark blue and green hues. It may ‘look fine’ on your computer screen, but when it goes out to film you get an awful surprise. So having a way to check that your colors are not getting stepped on prematurely is a good thing. Most often the culprit is some color adjustment done somewhere along the pipeline that has crushed the color, or an 8bit filter was used.
For other people not doing color-sensitive work, Super Histogram is more a point of curiousity and way to explore the color space of images. It may even be helpful to people doing green screen work as you can select ranges of the histogram in a multitude of channels, allowing you to find the best channel for pulling a matte.
Hopefully that answers your question. As far as adding keyframe generators like sound keys, this was in fact a feature I planned on adding to Super Histogram, but it will have to wait until the next version.
Best Regards,
Steven Walker
Walker Effects
http://www.walkereffects.com
steve@walkereffects.com