[EddieJones]

This is not implemented on S6 yet but there is a EUCON command called fixed level so it will be eventually. But this would only be reliable for 1 setting not a few as the difference in db would vary from studio to studio depending on room size, speaker sensitivity etc. So whilst you could line your room up to say 85, turning the volume down to 79 may or may not actually be 79 in your room.