There are two versions how a VCO may optionally access the bus:

Version 1. The CV coming from the bus is wired to the switching contact of
the socket at the front panel (provided that the corresponding jumper is
installed). In this case inserting a plug into the socket at the front panel
interrupts the bus CV.

Version 2. The CV coming from the bus is added to the CV applied to the
socket at the front panel (provided that the corresponding jumper is
installed). In this case both CVs are added.

In the beginning of the A-100 version 1 has been used for the A-110 (now
A-110-1). But many customers suggested that it would be a better solution to
add the two CVs. That way one could combine e.g. the CV coming from a
sequencer and a midi interface (e.g. for transpose) without the need of an
additional precision adder.

As far as I remember only A-110-1 uses version 1, all later VCOs use version
2. If version 1 is preferred the module has to be modified by wiring the bus
CV to the switching contact of the CV socket at the front panel and removing
the bus CV jumper.

Best wishes
Dieter Doepfer

> Hi to you all,
>
> for some reason I had it in my head that all of the A-100 VCOs
> had their 1v/o input jacks normalled to the CV bus (once the
> correct jumpers are set) but I have just discovered that this is
> not the case. My setup is as follows:
>
> A-1852 Precision Adder
>
> CV bus
>
> A-111-1
> A-110-1
> A-110-4
> A-110-6
>
> Having now re read the manuals, it appears only the A-110-1 has a
> normalled jack, so that by plugging into the 1 v/o you break the
> CV bus connection; the other VCOs keep getting a bus signal. Is
> there any way of normalling these other jacks so they behave in
> the same way My wish is to be able to plug in a CV to the
> precision adder but then override that if I want to.
>
> Regards,
>
> Neil