Cheers, Lefty! I called Roland today but they had problems with their internal telephone system and couldn't connect me to the right department. I'll try again tomorrow. I've found Roland UK very helpful in the past, supplying parts for out-of-production items such as knobs for my Blues Cube amps.
Proud to be The Man From Uncool.
I cried because I had no shoes - until I met a man who had no feet...