[LAD] [LAU] Ardour MIDI tracer

Ralf Mardorf ralf.mardorf at alice-dsl.net
Sat Aug 16 16:21:52 UTC 2014

On Sat, 2014-08-16 at 16:09 +0000, Fons Adriaensen wrote:
> On Sat, Aug 16, 2014 at 09:30:51AM -0400, Gene Heskett wrote:
> > > All computers do that. Just put a DI-box with ground lift between your
> > > audio interface and the speakers and the noise is gone.
> > > 
> > > Dennis
> > 
> > And get someone electrocuted. That doesn't happen on my watch because 
> > they'll never get it plugged in, I would not allow it.  There are several  
> > ways to fix a noise inducing ground loop, but a ground lift adapter is not 
> > one of them.
> A DI-box with ground lift does not interrupt safety ground.
> It just ensures that there is no ground connection via the
> audio path. Both items connected to it will (should) still
> have their own safety ground.


> Whether it will reduce interference from MIDI in a sound
> card is questionable.

I guess it wont reduce this kind of noise.

>  MIDI is isolated anyway. If anything of it leaks into the analog
>  audio path that means the sound card has a problem.

Increase the volume and you will hear digital noise from the analog IOs
of a card inside of the computer. Move the mouse and extra noise will be
audible, no MIDI is needed to get annoying noise. MIDI noise is very
silent compared to mouse noise, but there is some noise.

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