hey cheesesteak,
once you freeze a Midi Track you’re not able to change the froozen Tracks volume. Adjustments are done via the new audio track thats been created. And this volume will later be the reference for your mixdown. This is the default behavior of Cubasis.
So I’m not sure which issue you are experiencing. May you provide some addinational data? Which Version of Cubasis are you using and which is your choosen Mixdown-format?
kind regards
Ludwig