i mean thru MIDI. I assume Logic pro or Cubase are able to send, as MIDI data, the Level meters they have on their mixers.
i'm not sure if they do, but if i would be interested to know. interpreting midi is no big deal, if you know the status byte of the "audio volume message". if you don't know, you can use an application like midi monitor (os x) to see what kind of messages are sent at all.