Hey!
I see. I will look into the sum of Mid and Side. If there is another tool that does this properly I would be happy to see how they have done it. Let me know.
As for the colors of the Mid / Side in the Spectrum you can customize that in a theme: https://minimeters.app/help/theme-creation/
For the encoding failed errors, would you mind sending those files so I can see why they might be failing? Either reach out in the Discord or via contact@minimeters.app.
I will look into the other requests!
Joe