if you are in the US try one of those cheap plug adapters from 3 ends
to two on your computer's power cable plug, (so the 3rd circular ends
up removed from the equation) this solved a problem I had before with
my laptop causing ground noise. but might be more of a temporary
solution. I just don't use the laptop anymore :)


Carlos.

--- In Doepfer_a100@yahoogroups.com , "Anwander, Florian"
<Florian.Anwander@...> wrote:

>
> Hi
>
> we had similar problems last week within a large live setup. Around 15
> musicians with computers, lots of synths and softsynth, all mixed to
> submixers, which are led to a main mix. The lenght of the power and
> audio cables are 6 meters for the most musicians at least.
>
> Though this sounds like a bunch of humm traps the most participians do
> not have real problems, but two guys:
> Finally we could track down that these two are using

USB-Audiointerfaces

> where the interfaces are powered by the USB port, not by an external
> supply. This means that you have the dirty ground of the digital domain
> as audioground.
>
> Our solution now was simply to forbid this type of audiointerfaces.
>
> Florian
>
> stuadh wrote:
>
> > Hi,
> >
> > I would like to appeal to anyone with experience in eradicating a
> > probable ground loop. I've just done a bit of upgrading in my studio,
> > and I've developed a nasty buzzing in my system. I've narrowed it
> > down to the interplay between Logic 7 and my analogue synth. Of note
> > is that I have not changed anything inside the synth since before the
> > upgrade and that the problem exists even when the synth is turned off
> > but not when it is unplugged from the wall. In fact, I've just been
> > jiggling about with the plug and the buzz come back as soon as the
> > earth pin of the plug makes contact.
> >
> > The problem also only exists when Logic is running but not when i
> > run things like iTunes etc. It can also be controlled by the mixer;
> > turning down the channel volume or EQing it out work. I've also gone
> > around turning off and unplugging everything except the computer,
> > synth and mixer, but the buzz remains.
> >
> > Can anyone help
> >
> > Yours Aye
> >
> > Stuadh
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
> --
> Florian Anwander |ConSol
> Tel. +49(89)45841-133 |Consulting&Solutions Software GmbH
> Fax +49(89)45841-111 |Franziskanerstr. 38, D-81669 München
> email: florian.anwander@... | http://www.consol.de
>