I am looking for free true-stereo impulses...

[flex42]

anyway, i think i'll just buy the samplicity impulses (2 demo impulses available from the link above)

[Andrew Milne]

There are a number of multi-positional (i.e. true stereo, true quad, etc.) impulse responses in the Real Spaces section of Noisevault.

[93143]

True-stereo means that you have impulse responses for two spikes hard-panned left and right. This means you get realistic reverb for both stereo channels in your song, as if they were playing back on the left and right sides in the real space.

Usually with a single stereo impulse response, the whole reverb pans with the source track, which is unrealistic.

SIR is capable of ignoring stereo information in the input, and this results in a reasonably realistic sound (you get a nice stereo reverb with a centred tail). However, the early reflections in this case will be independent of the pan position of the input, which hurts spatialization.

True-stereo solves this. The only way to get true-stereo with SIR is to use two instances of it and be creative with the routing, but Pristine Space (as mentioned) can do it fine.

[greendoor]

Exactly - you need 4 channels for what is now know as "true stereo". I still think this is a recipe for crappy, phasey reverb in the mid position. I also don't think it should be called "true stereo" - it's as fake as you could wish for - in the mid position, where it's important. Similar to a lot of sampled pianos that are done with two mics - they sound good at the extremes, but crap in the middle. I'm not saying it can't be done right - because it can. But what are the chances that the impulses you get will be done right. There is a much easier solution to the simple problem of applying reverb to hard panned inputs. Simply constrain the pan for the reverb input. Cheapie hardware reverbs used to simply mono the L & R inputs - so regardless of the input, you always got a full stereo output. That's throwing away the baby with the bathwater. Currently, most vst verbs simply run as dual mono - so a hard left panned input only gets a mono reverb from the left output. Thats the opposite extreme, and not smart. All you need to do is reduce the stereo width of the reverb input - so a hard left panned input still sends a little signal to the right, and vice versa. You can do this with an insert panning effect prior to the verb. Using two seperate stereo impulses just seems impractical.

[93143]

So far the only true-stereo reverbs I've used have been either edited from a mono-to-stereo reverb (tweaking the early reflections, but keeping the tail identical) or generated in Voxengo Impulse Modeler. This prevents the bad mid-channel reverb you speak of, in the first example because the tail is invariant, and in the second because Impulse Modeler randomizes the ray generation, making the two tails entirely independent.

I have thought of a couple of really bad ways to do it, though. Depending on how the impulses are generated, it's possible to get a situation where phase-difference stereo enhancement (for instance) could lead to reverb phasing/cancellation on material in the centre.

Maybe this is a candidate for mid-side processing...?

[greendoor]

I just think that stereo is stereo, and only two channels are required (whether algorithmic or impulse). The problem of hard panned reverb sends is best solved with some logical input panning.

[93143]

It's true that with "stereo in" turned all the way down in SIR, it's not immediately obvious that any problem exists.

Try running a hard-panned single-sample spike through the Arts Acoustic reverb (or Ambience for that matter) and look at the result in an editor. You should see that the early reflections are hard-panned as well. It's a subtle effect, but it can be missed. For instance, I used to use an Audigy; the EAX reverb is pretty good, but I did notice the lack of pan response, and some gamers have complained about poor spatialization.

EDIT: I read your posts faster than usual, so I may have misinterpreted you somewhat. Sorry...

[thephase]

Hi all !!

new url for MoReVoX IRs is

www.morevox.com
_________________________________
www.ilpoggiorecording.com/morevox
is still valid.


bye

The phase