Equal loudness contour / Dynamic Equalization feature

Hi!

I was thinking of a feature that's found in for example some AVRs for matching the subjective sound signature at different listening levels: Equal loudness contour or dynamic equalization. Since GLM already has both the speaker gain and actual SPL information from the calibration mic, this seems like the adjustment would be possible to do continuously inside GLM. ISO 226:2003 standard is one source I looked for information about this and after a quick vibecoding experiment with the GLM MIDI output (volume) -> a Python app -> Equalizer APO filter this seems to work quite well.