Why not ask M. Combelles at the company? I've received two helpful replies to my emails, though it may take a little time. I've assumed that the volume control manual knob is analogue and what the remote volume control is digital, but I'm not sure. The manual is the worst, least informative I've ever seen, except for a cheap Radio Shack multitester, circa 1955, made in Japan, whose manual's English was very much made in Japan. Good luck! I found the email address somewhere on their web site.