A GREAT day for Cubase/Eucon users.
 

WOW! INCREDIBLE!

At first I thought I was hallucinating when I saw this in the Eucon 'What's Fixed' list:

• S3 faders could cause unexpected changes to values in Cubase (GWSW-11553)

...but sure enough, after all these years, Avid have fixed the issue whereby you would get erroneous channel volume values when banking the controller and touching a fader. I had given up hope a long time ago but today is a great day. It is FIXED!

Thank you Avid.