[sdiy] What is chaos?

[John Mahoney]

>>Ian, would you say the 3 VCF feedback glorp patch is chaotic or not?
>
>[It] could well be, although I'm not exactly sure what the setup 
>is.  Three VCFs will give you a system of differential equations 
>that is at least third order, which is the minimum needed.  There 
>also needs to be an appropriate nonlinearity.

Yeah, not sure why I expected you to know that. Below, then, is the 
info from Moe himself (it's a reply to a private request from me but 
I'm sure Dave won't mind).
--
john



Yep, I did the glorp patch, sort of a tribute to RR [Robert Rich]. 
Here's the link to the original sound:
http://www.hotrodmotm.com/sounds/glorps.mp3

The post where I explained the patch:
http://launch.groups.yahoo.com/group/motm/message/26934

And here's the text reproduced:

Re: Glurp without infringement

That patch sounds pretty complex, doesn't it? Nothing could be 
further from the truth. You are listening to only 3 modules - 2 
MOTM-440s and 1 MOTM-480.

The 480 adds nothing more than a little swept color to the sound. All 
the frying sounds, moans, thunder cracks, etc. are generated by the 
two 440 filters oscillating, and feeding each other's FM1 input, 
which is cranked all the way to -5.

Everything else is just tuning the frequencies until you get an 
interesting interaction. Because you are using feedback, you can get 
it to teeter in and out of an unstable situation. You can spend hours 
conjuring up howls from hell out of this basic simple patch.

Try sticking 3 or more in a feedback loop, using oscillators as well 
as filters too. When doing this kind of heavy FM, I like to use sine 
waves as starters because if you use saws or something rich the 
harmonics can overwhelm you.

[end]