Hi Dietz and VSL Team:

For MIR reverb IRs will you be commissioning folks like Ernest Cholakis, or others, to produce IRs for MIR? Importing existing full stereo Pure Space IRs would be one thing, but a special and full VSL MIR implementation of them sounds to me like a match made in heaven [[[;)]]] .

The reason I mention Ernest here specifically is that, thanks in very large part to everyone's high praise here for his IR libraries, I licensed both "Pure Space" libraries and find them absolutely extraordinary, in every meaning of the term. And that is not the kind of praise that I toss around lightly, (except for VSL offerings [:D], and a few select others).

Incorporating them into the more complex spatial and other currently mysterious [[[;)]]] aspects of MIR would be on the critical path challenge if you are considering this sort of approach, however I can't imagine the result being anything other than astounding with the VSL Pro libraries.

- OR -

Are you planning on VSL produced IRs surpassing his Pure Space collections in terms of sonic quality? Is that even possible? [*-)]:

I'll be very eager to hear what you can share...

thanks, and best regards... ...jim

Hi Jim,

I'm curious what you mean with "existing true stereo IRs" from Ernest? I also have Pure Spaces, but as far as I understand they are only mono (single emitting point) to stereo. For true stereo you need two stereo impulses, one to process left channel info and for the right channel.

With my Pure Space impulses I have to narrow the stereo width of the input, otherwise lateral sounds in the stereo field may sound detached and not in the same space.

So, I think they could be even better than they are now. [[;)]]

BTW: here is a nice Windows Media video file with some background on recording impulses for the Waves IR1:

http://www.waves.com/objects/movies/mov_behind_scenes_ir1_01.wmv

(and enjoy the professor's English [:P] )

Cheers,

Peter
www.PeterRoos.com

Hi Peter

@Another User said:

I'm curious what you mean with "existing true stereo IRs" from Ernest? I also have Pure Spaces, but as far as I understand they are only mono (single emitting point) to stereo. For true stereo you need two stereo impulses, one to process left channel info and for the right channel.

oops, you're absolutely right about Pure Spaces as stereo, from a single emitting point, [:O]ops: (although I occasionally do have some very interesting fun "doubling up" Pure Spaces IRs in the Pristine Space plug-in in 4 channel mode, and also doing the same in the IR1 plug-in) [:D].

Interesting that you hear them latterally detached - I've really enjoyed the widths in the stereo fields. If you would be so kind to describe specifically how you are narrowing the stereo field for a particular Pure Spaces IR, I'd like to try replicate it and try to hear what you are hearing.

I had seen the Waves IR1 wmf, and it is amazing to me what developers are doing with technology in this area - very thoughtful and exciting work. Who'd have thought we could ever put Pink Floyd inside the Great Pyramid Kufu at Giza !!! [H]

best regards... ...jim

Jim,

One of my problems with the mainstream impulses is that with very lateral sounds (close to left or right, like French Horns and Trumpets), they will "come out of the convolution" with an ambience that is also at their lateral position. Just try this, pan a trumpet to the right, with only a bit signal in the left channel. Now put this through IR-1 or Pristine Space with a single stereo impulse Wave.

You would expect that the sound of the trumpet will travel through the entire "hall", which should be perceived as a virtual room with its acoustic gravity at the center. But it won't sound like that, because single stereo impulses cary no cross-channel information. The convolution process does not know how to handle position-based information over time... So, the convolution is simply "weighted", with more ambience applied to the right side, where most of the signal is.

Sad but true. The common fix, is to make the input to the convolution more narrow, for instance with the Waves S1. The original trumpet will then still have its dry component panned to the right, but its sound will be inserted more centrally into the virtual room.

I think that the applauded quality of AltiVerb probably can be attributed to its support for using two impulses, one for the left side of the stage, and one for the right. Back to my example: we need an impulse for sound emitted from the left part of the stage and one for the right part. This would include the required temporal and positional information into the impulse set.

I still have not found good stereo-stereo impulses in the public domain, so I can't (subjectively) validate this assumption with my Pristine Space.

A few years back, Acoustic Mirror was the major convoluter for the PC, and it supported only single stereo impulses... I think this is probably the reason why Ernest is not yet offering true stereo sets, he probably started his projects when Acoustic Mirror was the main thing...

Peter

Very interesting discussion!
Good point with the mono to stereo thing on convoluters. That might explain some experiences I had.

I was a bit surprised about the omnidirectional loudspeaker this professor was so proud of. I´m not aware of any instrument which radiates omnidirectional. Even the double bass is quite directional.

A question to the MIR-project: Will that be a mixing frontend directly attached to Gigastudio, or can it be used also inside an audio editor? The step in the audio editor is very important for my workflow, I couldn´t work directly from Giga to CD.

Bests,
- M

Mathis -

as much as I enjoy to talk about the MIR.E-project - please understand that I can't spread too much information here, partly because some aspects are still in developement, while others are simply too "hot" to be told before the actual release. - Stay tuned ... ;-]

/Dietz - Vienna Symphonic Library

Mathis, I think it's safe to say that VSL's approach to the universe is to roll up their sleeves and - with the patience of Job - apply brute force to a problem, whether they're sampling instruments or spaces!

What the Prof is doing is less precise, taking more of an "average" response. For that, it probably makes more sense to excite the room in all directions. He's using sine sweeps, not generating individual impulses for each instrument.

*apply brute force* - i like that, although if generally speaking this could be understood more as plain power and not so much as the clever system behind
christian

But surely you must beat the musicians when they play badly? [:O]

Hi Peter,

Thanks very much for your thorough description - it is very informative and helpful.

Regarding:

@Another User said:

I think that the applauded quality of AltiVerb probably can be attributed to its support for using two impulses, one for the left side of the stage, and one for the right. Back to my example: we need an impulse for sound emitted from the left part of the stage and one for the right part. This would include the required temporal and positional information into the impulse set.

I'm not sure that I understand how you're describing Altiverb as different from Pristine Space or IR-1 in this regard. Don't Pristine Space and IR-1 both provide for the proper use of "true stereo IRs", (i.e., left and right stage IRs)?. What does Altiverb provide that Pristine Space or IR-1 does not in this regard?

Also in this vein, are you aware of any algorithms and associated techniques for using them, (all implemented in the form of a plug-in or stand-alone application), that might provide a temporary workaround for existing "mono-stereo IRs"?. I'm referring to the possible use of a plug-in or application that might be capable of massaging one "mono-stereo IR" to produce a "pseudo" "stereo-stereo IR". The objective being a substantially useful approximation of a "true stereo-stereo IR" that mitigates very lateral sounds from coming out of convolution with an ambience at their lateral position (without having to narrow the input to the convolution)?

Alternatively, are you aware of commercially available "true stereo IRs" that are of comparable high quality to Ernest's "mono-stereo" Pure Space collections? (other than those for Altiverb, which, I believe, are in a proprietary format and for Mac only)

The reason for all of my questions here, btw, is that I would like to use the "best acoustical spaces" that are possible to "contain and deliver performances" - I can narrow inputs with Waves S1 as you've described, but would prefer "better solutions", if available.

thanks very much, and best regards... ...jim