Il giorno 29 giu 2018, alle ore 09:48, Florian Anwander fanwander@... 1 < Doepfer_a100@yahoogroups.com > ha scritto:

Hi Diego

Am 29.06.2018 um 07:43 schrieb Diego Ragnini   diegora@...   [Doepfer_a100]:
>
> So, if I use brand new mono Doepfer cables and the R2M black box is  
> connected via these cables to A-100 systems which are properly  
> grounded then everything should be fine, right
>
Yes.

> What happens if one provides an external wire to connect the black box  
> to the ground/earth (not too differently from what I will do for the  
> A-100LC3 cases)
I cannot judge at the moment, whether the housing is connected to the  
signal ground. Basically there is no need for that, as there is no  
connection between the (signal- and housing-) ground and the  
earth/ground of your wall outlets. There is no need for because the R2M  
uses a wall wart. There is no hi voltage inside the device.

> Does the ground uses the “tip” of the cable
It does not use the tip, but either the "shaft" or the "ring". In fact:  
It is defined as to use the shaft, but it assumes the shaft of a mono  
jack, which reaches up to the "ring" position of the stereo jack. Some  
Doepfer modules are equipped with Cliff sockets. Those sockets have  
there shaft-contact at the position, where a stereo-jack has its "ring".  
There is nothing wrong with it, as it relies on using mono-cables.

>
> The MS20 also shows a 1/4 female jack labelled “GND": how do I use  
> this And is it always the tip providing the connection
This is a big misunderstanding opf the MS-20. This symbol means, that  
the socket will switch the tip to ground, when the corresponding  
function is active.
Example:   https://www.muziker.de/image/2/0039/9lan.ms20mini_detail4_jpg.jpg
In the low right corner is a socket which is connected to the push  
button aside the keyboard. The "GND"-symbol means: "The tip of a cable  
that is plugged in here will be shortcut to ground, as soon as you press  
the button". This is the function of a so called switched trigger.  
(connect this socket with the MS-20s trigger-in-socket and you will be  
able to trigger a note).

Florian

http://www.florian-anwander.de