granular time stretch/pitch shift/mangler

Hello,
I've been trying to make a beat synced (well, tempo influenced) granular time stretcher/pitch shifter that sounds like c-lists beatlookup granular time stretch but live - the only problem is i'm not really that sure what defines 'granular synthesis' or how to go about hacking the beatlookup parts out of it out and into a small core cell specifically designed for it.
I have made the following using my basic understanding of everything and the ableton pitch shift macro from exiles keymasher (because it was easy to take out and change for this purpose unlike c-lists beatlookup time stretch which is spread across several different macros i have little understanding of), but it sounds a bit rubbish to me...
I'm pretty sure what im doing isnt actually granular, can anyone point me in the right direction?
Thanks,
Ash

 

i would really like somone to help me out also with some advice in building a live timestretching device with Reaktor..

 

i don't really have time to pick up this project and be of any help (i'm lost with this stuff too) but couldn't you just use clist's ens. and delete all the things you don't want?

i don't know what the final goal would be for either of you, but it would work and saves you the time of learning dsp in a weekend. i would say make a copy of beatlookup 7 and just clear things you don't want, and stop when it doesn't work anymore. hit undo once and you should be good.

 

like this.

 

i have a fairly simple custome granulator in the user library called buffer::graf, but this requires explicit sampling of the signal via a trigger.

one thing that helped me learn, is the pitch shifter macro in building blocks, which has a core-cell that does all the work.

the basics is that there is a master clock/phase source, and at each grain either a smaller grain clock is triggered or the maiin clock is transformed somehow. there is usually 2 of these grains that are overlapped. and, each grain needs a "window" (envelope) to smooth the transition between the 2 of them.

 

This is the kind of thing i was looking for, thanks for the explanation, i now think I understand the basics of granular synthesis.
I ended up finding a core version of the grain delay module and adapting that.

 

the one by Chris List from 6 months ago or so? that one is great.

 

nah, it was posted by innominate here: http://www.native-instruments.com/forum_us/showpost.php?p=168272
but if there is another i'd like to check it out/compare quality etc.

 

I'd try to find the CList one -- much more adaptable and universally applicable, I think.

Though if you continue using the one you mentioned, here's a quick change which saves some CPU -- removing the initial Delays, and instead adding the delay times together, like in the attached.

Also, reading from the same buffer could help (two taps on one delay line rather than two separate delay lines).

 

This is what kid_sputnik's talking about:
http://www.native-instruments.com/index.php?id=userlibrary&type=0&ulbr=1&plview=detail&patchid=5913

...it's just a macro that replaces the grainsampler module with a grainsampler that does live recording.

Cheers,
CList