u-he

psylevation · Post by **psylevation** » Thu Feb 01, 2007 4:26 pm

I just got Zebra 2 recently, I've been messing with the artificial reverb designer that came with it. I'm having troubles understanding what all the controls do. I figure the "T" controls are maybe taps like individual delay taps? and the controls control the rate? The other side with the "A" controls are possibly predelay?

who knows?

Are the "A" controls linked to the "T" controls by number respectively? Actually what do they do? I'm just kinda lost with it, can anybody give me a run down? what are the options in the middle for? Is that direction of routing? or some kinda algorithm selection....

you see my point?

beej · Post by **beej** » Thu Feb 01, 2007 5:34 pm

It's all part of the mystery, and the fun..!

This plug was an internal plug that Urs did to help design his reverb algorythms, so the knobs control various aspects of whatever model he's using in there. I don't know what they are - you'll just have to T&S (tweak & see)

Urs · Post by **Urs** » Thu Feb 01, 2007 9:33 pm

Any user manual for ZRev would start with these words:

Before tweaking any knob, google for "comb allpass filter", "feedback delay network", "jot householder matrix", "schroeder moorer reverb"

So that:

Now, welcome to ZRev. ZRev is the mother of digital reverb implementations (non-convolution): It's all of what you just learned, where the left section represents a feedback delay network while the right section represents two cascades of nested allpass filters, feedback being adjustable for each cascade. With ZRev you should be able to dial in any artificial reverb thinkable. If you find Ts and As that do not exhibit metallic ringing, please send them over immediately.

The idea is, if enough people start messing with it, it's like that SETI screensaver: Someone will eventually come up with a nice sounding set of reverb coefficients!

beej · Post by **beej** » Thu Feb 01, 2007 10:16 pm

Bet you wished you hadn't asked now, eh..?

Howard · Post by **Howard** » Fri Feb 02, 2007 1:04 am

beej wrote:Bet you wished you hadn't asked now, eh..?

I also wish he hadn't asked

"Bohemian villages" I say!

I googled those words anyway - the following looks like quite a simple "primer" before looking at all the rest: http://www.music.mcgill.ca/~gary/614/week3/reverb.html

I tried all modes with several different "mutually prime values", but never managed to get rid of the ringing (after 4 hours trying) without resorting to deeper LFO modulation (which is too regular). I suspect that ZRev is still missing something important...

dln · Post by **dln** » Fri Feb 02, 2007 1:07 am

Urs wrote:Any user manual for ZRev would start with these words:

And end with "Gotcha!"

Urs · Post by **Urs** » Fri Feb 02, 2007 3:19 am

Oh... prime numbers are a myth in reverb design. They simply don't want to work...

Howard · Post by **Howard** » Fri Feb 02, 2007 12:24 pm

Urs wrote:Oh... prime numbers are a myth in reverb design. They simply don't want to work...

Hi Urs
I understand "mutually prime" to mean there is no common denominator between all values.
11, 12 and 13 are "mutually prime" although 12 is not a prime number.
Such a "cloud" of values could be automatically generated?

Urs · Post by **Urs** » Sat Feb 03, 2007 7:25 am

Well, you should get supermutually prime numbers by using fractional values...but still, a good sounding reverb is try, error, luck and experience...

Howard · Post by **Howard** » Sat Feb 03, 2007 10:09 am

Urs wrote:a good sounding reverb is try, error, luck and experience...

Too much 1) and 2), not enough 3) or 4) here!

psylevation · Post by **psylevation** » Sun Feb 11, 2007 7:56 pm

..yep I'm not sure what I started here...but It makes me want to delve in more! I like capable possibilities of the unknown, thanx for the detailed explanation Urs, now back to my T&A...<<< hmmm

bmrzycki · Post by **bmrzycki** » Sun Apr 29, 2007 3:12 am

Urs,

I just spent a few hours messing around with all the knobs in ZRev and found a setting or two I liked. It was then when I looked for a "Save" button that I realized there's no preset saving! Is it possible to add this in eventually? Especially given the complexity of all the knobs in such a small interface...

(you probably hate me by now, all I ever do is ask you for more code)

Urs · Post by **Urs** » Sun Apr 29, 2007 10:41 am

Well, ZRev is not a synth with thousands of patches to manage... you can still save presets from the host interface (commonly somewhere on top or bottom of the editor window)...

Nah, no hard feelings. It's good to see what people like/dislike/miss

k-bird · Post by **k-bird** » Sun Apr 29, 2007 11:08 am

Ooh, the Diffusion knob makes a pretty noise when i max it out.

Rangtangtang · Post by **Rangtangtang** » Sun Apr 29, 2007 11:11 am

u-he

KVR Audio

anybody have experience with the artificial reverb designer?