First, I use COS pro a lot. It’s fantastic. It would be great if we had an option to save the calculated EQ curve along with the ceiling when saving a setting though. If I save it in Reaper as a Reaper setting, or iZotope RX, then the EQ compensation curve gets saved, but that doesn’t happen when saving natively.
The reason I ask is, I want to test COS Pro through DDF’s Metaplugin (can load and oversample any plugin up to 64x as long as that plug supports the MgHz sample rate needed) and then invert and sum the two results to see if there’s any mathematical benefit to oversampling COS Pro. I ran a similar test in Reaper and iZotope RX when testing Online vs Offline rendering and found full speed Offline rendering to be mathematically identical, fortunately.