> It looks like the box next to the bus connector is a provision for

a

> jumper, but Doepfer don't fit it (you'll notice one pad doesn't go

Indeed, if you go to Doepfer's site, under the A-110 module
description you'll find a link to the service manual, which contains
the schematic, and there is clearly shown said jumper, next to 'ST1'
the bus connector!

Tim