> Guys, can you tell me where the jumper is on the A-110 circuit board which enables or disables access to the CV signal of the Buss please I am not sure that this is what is causing my occasional 'transpositions', but it is the closest thing I have to a clue as to how to resolve my issue.

Is it the "Int. CV" jumper directly above where the buss pins are I'm just going by what's shown on http://www.doepfer.de/a110_tec.htm and http://www.doepfer.de/A100_pictures/doepfer_a110.jpg ...

Good luck!
Zoë.