Doepfer

Hi All,
In my rack I have 4 VCO's with a multiples module next ot them, if I 
plug a CV signal into the multiples modules ALL the VCO's receive 
the CV signal without any patching required. No cables connect the 
multiples to the VCO's and no internal patching.....strange eh?
If I patch a CV to 1 VCO then that one will follow the new CV while 
others still follow the multiples CV.

It seems that the CV patched to the multiples is getting to the 
system bus somehow.

It's very because it saves on cables and doesn't seem to be causing 
any damage to the modules, but I have no idea why it's happening.

Has anyone else had this in their setup?

Only happens when cable is connected to the multiples.
I have no midi-cv module in my rack, its an external midi cv 
convertor.



--- In Doepfer_a100@y..., "Andreas Lindholm" 
<andreas.k.lindholm@t...> wrote:
> Are you sure the same thing doesn't happend also when you do not 
connect any
> wires to the vco's at all? It is standard behaviour that all vcos 
get their
> cv from the system bus if the sit on the same row as a midi-cv 
interface.
> Otherwise it seems odd to me.
>

Are you sure the same thing doesn't happend also when you do not connect any
wires to the vco's at all? It is standard behaviour that all vcos get their
cv from the system bus if the sit on the same row as a midi-cv interface.
Otherwise it seems odd to me.


----- Original Message -----

From: "jmaddocks1975" <jmaddocks1975@yahoo.co.uk>
To: <Doepfer_a100@yahoogroups.com>
Sent: Tuesday, June 18, 2002 9:20 PM
Subject: [Doepfer_a100] strange CV happenings!!


> Hi All,
> In my rack I have 4 VCO's with a multiples module next ot them, if I
> plug a CV signal into the multiples modules ALL the VCO's receive
> the CV signal without any patching required. No cables connect the
> multiples to the VCO's and no internal patching.....strange eh?
> If I patch a CV to 1 VCO then that one will follow the new CV while
> others still follow the multiples CV.
>
> It seems that the CV patched to the multiples is getting to the
> system bus somehow.
>
> It's very because it saves on cables and doesn't seem to be causing
> any damage to the modules, but I have no idea why it's happening.
>
> Has anyone else had this in their setup?
>
>
>
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>
>

this is very bizarre sounding, this mult - CV thing.  I was thinking 
that possibly there is a short in one of the mult jacks so that a 
siginal in there is making it to the faceplate of the doepfer and 
interconnecting somehow that way to the VCO.  But if this were 
the case you'd see a billion other problems.

I split my mults from 1 x 8 to 2 x 4.  I had to be careful when I did 
this and I did get a short between signal and ground on one of 
them because of the large blobs of solder used by Doepfer on 
those jacks on the mult.

Pull the mult out and look closely.  For giggles, with the mult 
removed, get the same CV that was bleeding before and touch 
the tip of the patchord to the faceplate of the VCO - do you get the 
same thing happening?  If you do, there is a short in the mult 
from one of the signals pins to ground making it to the circuit 
through the metal can of the pots.

Turn the power off and read the resistance between the signal 
tip and the ground ring of a patchchord that's plugged into the 
mult.  if it's anything less than infinite, this is probably your culprit.

Either that or the CV signal is of extremely high amplitude and 
you're getting RF interference, but at this point I would look out 
my windows for flying donkey's - it's highly unlikely.

If all else fails, send a letter off to Dieter.

hope this helps - let us know what fixes this bizarrity.

best,

Peter