This Volume is the same, as you set in the Preview of MediaBay. It’s the Preview Volume in general. So you can lower it for example in the MediaBay > Preview.
Good afternoon Martin & thank you for your amazingly prompt reply!
I’ve been using modern Cubase since 10.5 / 2019 (ignoring my 5.3VST 1990’s days) and have never got around to looking up how to do this as I stupidly assumed it was some sort of sofwtare/hardware imbalance that required a lot of experimentation!
So simple so thank you again and have a great day!