# Intro to the "Dattorro" reverb structure

As far as I can tell, the vast majority of FV-1 reverbs use variations on the structure defined in this paper published in September 1997 by Jon Dattorro.  Hey, that's relatively recent; only 25 years ago.  The author claims several times that this structure is good for plate reverb emulation.

{% embed url="<https://ccrma.stanford.edu/~dattorro/EffectDesignPart1.pdf>" %}

The small reverb we've been looking at recently is even further simplified in that:

* There are only 2 all-pass/delay line pairs in the "tank"
* There is no modulation of the all-passes
* There is no damping filter or other explicit tone control anywhere

I've noticed that in the online archive of FV-1 programs, several are called out specifically as "Dattorro" reverbs, although I don't think I've ever encountered the term in Spin's documentation.  We'll take a look at some of these in a future article.

Here is the [Spin Knowledge Base section](http://spinsemi.com/knowledge_base/effects.html#Reverberation) showing a very Dattorro-like structure.


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