[LAU] Strnage MIDI behaviour

Ralf Mardorf ralf.mardorf at alice-dsl.net
Sat Dec 15 18:22:19 UTC 2012

On Sat, 2012-12-15 at 13:10 -0500, Al Thompson wrote:
> On 12/15/2012 01:01 PM, Folderol wrote:
> >
> >> It was either Gremlins.... or you forgot to properly adjust the Johnson
> >> Rods.
> > I find this sort of thing is often caused by the 0dB attenuator, monodes, or
> > the 360deg. phase shifter :)
> >
> I try to stay away from the 360 Degree Phase Shifters.  They introduce
> too much latency, and it varies with frequency!!!

This joke has got some truth in it, since 1:1 transformation really is
done by e.g. di-boxes, MIDInterfaces etc., to avoid issues, but the
galvanic isolation can cause issues, since 1:1 by a transformer could
cause issues for the circuits, since a transformer ships with
"attributes". An opto-coupler also comes with "attributes", that can
cause unwanted side effects.

In the end voodoo isn't voodoo, it's just not visible that there is a
serious cause.


More information about the Linux-audio-user mailing list