Correlation, when using S1 and Altiverb positioning together for panning

[Felix Bartelt]

I don´t know much about correlation, but as far as I´m concerned, it is not good, if I get a negative correlation amount in Logics Multimeter. . I remember, that Miklos proposed, to use a combination of waves S1 an Altiverb stage positioning for panning. But when I try this, I get a negativ correlation, as soon as I move the speakers in altiverb just slightly to one side, while using S1 at the same time. . E.g.: My HO-4_sus use a S1, set to Rotation: -16,0, Asymetry: 2 and width: 0.37. Without Altiverb speakers beeing moved left, correlation is fine, but as soon, as I just slightly move the speakers left, the correlation meter gets to the red (negative) zone. .Is that a problem? (I´ve tested a John Williams song, which almost never gets negative correlation.) If yes, how do I solve this? Should I use just one plugin for panning?

[Beat Kaufmann]

Hi Felix

Phase shifts are normal between the two channels - That makes the stereo-effect.

But they can become a value which is so big that you have frequency deletes - specially

while switching the two channels to a mono signal.

The signal seems to sound weak and/or strange.

Theory:

When the signals in both channels do have the same course the phase shift value is 0°.
The correlation meter shows +1.

For the situation where the signals are 90° shifted the correlation meter shows the value 0.

If the signals are shifted with an angle of 180°, the Left channel does the opposite of the right channel.
The correlation meter shows -1.

It is true that Altiverb can produce such -correlation values.

But there are two good solutions which are easy to practice (together with Altiverb):

1. If you have a correlation between -1 and 0 use the possibility to turne the phase of your host program.

Perhaps you don't have the possibility. There are VST-effects which can do this job.

As an example for WIN and MAC: http://www.sonalksis.com/index.php?section_id=99 (Flip ø)

2. Use the possibility "shifting the speakers" in Altiverb. Sometimes it only needs a little shove (some 1/10 mm

with the speakers) and the -correlation changes its value to a positive average.

Let me advertise my "helpers": This theme and much more are explained/handled in my tutorials..Step9. [:$]

All the best

Beat Kaufmann

[Felix Bartelt]

Hi Beat, thanks a lot! Specially moving the altiverb speakers slightly, helped a lot. Is a little bit of negative correlation o.k.? On some patches, there´s only a few notes, having a negative value, while the rest is at about + 0,5.

[Beat Kaufmann]

@Felix Bartelt said:

Hi Beat, thanks a lot! Specially moving the altiverb speakers slightly, helped a lot. Is a little bit of negative correlation o.k.? On some patches, there´s only a few notes, having a negative value, while the rest is at about + 0,5.

 

Hi Felix

With stereo signals but also with convolution reverbs it' is a normal thing. Important is that the average is on the + side.

The more the better - but a nice natural stereo width involves "minus correlations" from time to time.  [:)]

I'm happy that my upper post helped a bit.

Beat