To rule out all unknown variables, please create a test session with just one mono source, set its Width to zero and feed it with pink noise (or another well-defined test signal, but not a sine wave). In MIR Pro activate only the Main Mic, use a pure cardioid-based stereo setup and keep the Dry/Wet ratio at default. Move the Icon from the left to the right and watch the stereo image. It should be more or less what you seem to expect as "normal".

Now switch to a Blumlein Mic setup (i.e. two crossed Figure 8 capsules). You will see that the imaging "flips" to to opposite side as soon as the source crosses the 90° in-phase area (i.e. 45° to the left and the right of the Main Mics center axis, shown by the "arrow" of the microphone flower). The MicSetup you've chosen in your example is much like Blumlein biased towards the front, which explains the effect you hear and see.

As soon as the direct signal component is completely missing (which is what happens when you keep MIR's signal path at 100%) Wet, the effect will be less predictable due to all the reflections and phase cancellations in the room, but similar. This is of course also true for a (always fully wet) Secondary Mic that points towards the back of the hall. 

HTH,

The pink noise source seems to remain 100% mono no matter where on the stage I place it and wet/dry ratio has zero effect on the left/right image. What is strange is that the MIR Pro pop up indicates that changing the wet/dry ratio is represented in its stereo output meter but Cubase's output meter stays mono. And the audio is completely mono. Not sure what is happening there. See video.

Then I set up a violin staccato sample in VI Pro. Now the dry signal is very much on the left of the stereo field but the wet signal is again 100% mono if not more on the right. But if I point the source at 0.0° it immediately sounds better. But at -45° the positioning is lost completely. See second video

Does this mean that I should really be pointing all my sources at 0.0°?. I always pointed my instruments at the conductor position as this is how players traditionally sit. But now I am questioning that approach as 0.0° or close to it seems to get far better results.

I'm not sure about this behaviour. It does not seem to represent the way a sound source is processed in the real world.

If I stand on your left side facing you at a -45° angle and speak to you , you are going to hear me more with your left ear. Your right ear will not be hearing the reverberated sound waves of walls as much if not more than my direct voice in your left ear. I understand that the right mic does not have a physical obstruction i.e. a cranium to contend with, but there should still be more signal reaching the left mic than the right. Distance also should play a role here.

For such an advanced piece of software, I just think that this behaviour is counter intuitive.

@Another User said:

[...]For such an advanced piece of software, I just think that this behaviour is counter intuitive.

I'm not sure how to answer this reproach. I have the slight suspicion that you're somehow expecting a typical power-panning-like behaviour you would get from a simple algorithmic stereo reverb, but that's not how actual acoustics react (... sorry if I'm stating the obvious).

I think this particular venue exaggerates the behaviour I am finding difficult to get my head around as it is very narrow. Also, when I point a violin (icon) that has upward facing sound holes at the right wall, I don't expect the reverb in the room to behave like I am pointing a megaphone at that wall. 

Thanks for all the help.

Re. "directivity": Did you use the actual Instrument Profile for the violin, or just a General Purpose profile?

In any case: We put enormous efforts in measuring the actual frequency dispersion patterns of most instruments used for the original Vienna Instruments back then (... we even developed a new measurement system for the task). If you already find MIR's behaviour "counterintuitive", it would be interesting to get your reactions to some of these directivity profiles. :-D

-> https://www.vsl.info/en/manuals/mir-pro/think-mir#instrument-directivity-profiles

Kind regards,

Yeah, those flute lines are all over the place. BTW I always have the correct profile selected.

I think if there was more information coming from the floor or the ceiling?. Especially when in the 'Conductor' position it would help. Then the 100% wet signal would provide more positional information.

You know - MIR Pro is what it is until the overdue upgrade is ready for prime time. If you don't like the Directivity feature or its implementation, then please just use an Omni setting from the General Purpose Profile selection for your sources and on you go. It's ok to do things differently - even an electric guitar wasn't invented to be played fully distorted :-) 

Regards,

I just went through a few profiles and they all seem to be accurate except the violins and violas. Violins and violas face upwards not horizontally. So I hope this gets fixed in the future and in MIR 3D. 

If you could tell me which of the following you assigned to the orchestral violins profile I would appreciate it.

99a, 99b, 99c, 99d, 99e, 99f, 99g, 99x

P.S. I just added MIR as a plugin and that is what the icon looked like. There must be a bug. 

If _this_ is what the MIR Icon looks like on your system, then there's indeed something broken. 8-0 ... here you see the Icon's actual shape and the functions of all its elements.

-> https://www.vsl.info/en/manuals/mir-pro/creating-new-project#mir-icon-overview

If the problem persists please get in contact with support@vsl.co.at, including as many information about your setup as possible (OS type and version, host type and version, RAM size, CPU, any other kind of potentially influential hard- or software components).

Re - Instrument Profile: If you're referring to the Orchestral Strings for Vienna Instruments, then there's a dedicated profile available for them (01/21), based on similar directivity measurement like the ones for the Solo Violin  shown in my previous posting (... which means that there is pronounced signal dispersion towards the ceiling). If you want to avoid any kind of directivity then please use the Omni-setting (00/99a) from the General Purpose profiles, or the Wide Cardioid (00/99b) if you want to hear at least a bit of emphasis towards the front.

HTH,

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