Sounds like you want a granulator ... check out the grannie-basher etc: 
http://lists.puredata.info/pipermail/pd-list/2009-06/070773.html

I'd imagine you could use [bonk~] or just the incoming signal envelope to 
trigger sample grabbing, then feed that into a granulator ...

On Jul 3, 2012, at 3:52 PM, Birthe wrote:

> Dear List,
> 
> on thursday, 12th july, we want to present a sound installation in Hamburg. I 
> am looking for tipps to work with Pure Data.
> 
> The installation will look like this:
> There will be a flexible wooden surface, ca. 1 square meter. Under that 
> surface there will be some plastic bottles. Making a step on the surface the 
> bottles will crack. The signals will be received by two microphones.
> 
> We want to use Pure Data for making the signals sound like breaking ice. It 
> should simulate the situation going on a frozen lake and suddenly you can 
> hear a big break.
> 
> We have two loudspeakers and a big subwoofer. Maybe it would be nice to use a 
> pitch shifter and a time stretch to get this effect. Does anybody have some 
> patches like this? My knowledge about Pure Data is not as big, so it would be 
> really nice to get some more ideas from you. Maybe you have some more ideas, 
> which effects and filters we could use? Would be nice to hear from you. Thank 
> you!
> 
> All the best,
> Birthe
> 
> 
> 

--------
Dan Wilcox
danomatika.com
robotcowboy.com




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