[PD] Granular Cross-fader

Kyle Klipowicz kyleklip at gmail.com
Thu Jan 11 22:14:09 CET 2007

Good feedback!

I'm not so concerned about beat matching with this thing as I am
transitioning from multiple sections in a mix using Ableton.  I'm more
just wanting to have say a vocal/acoustic guitar verse slowly blend
together and then (granularly) fade into a drumset/keyboard chorus or
something like that.  My aesthetic right now is very much one of "pop
structure becomes abandoned into a chaotic transition into another pop
structure."  Rinse and repeat as you'd like.

Do you think this could be done in real time in an efficient fashion,
using a kind of doubled up granular delay network?


On 1/12/07, padawan12 <padawan12 at obiwannabe.co.uk> wrote:
> Sounds good Kyle.
> If you listen to old skool house DJs they often use the tone
> control to start with only the hi-hats/top of the mix (because that
> is where you get the best time acuity) then as the mix fades to the
> second part they drop in the bass.
> For the mostpart only a few parameters will work for the grainsize
> and randomness without it sounding watery and blurred, an optimal
> window size and overlap.
> The starting assumption is that you have two audio files and two
> phasors/line segments that give you a pair of timelines that are
> locked in beat sync.
> The most obvious "granular mix" effect is to mix N grains from
> one side with 1-N grains from the other per unit time.
> But the weight/density of the sound is a product of the number
> of grains per unit time and the grain size, so another mix would
> be to increase the size of one grain stream and reduce the other.
> You could make another interesting effect by "dissolving" one
> stream into chaos by adding random time offsets to blur it out,
> and then quickly mixing the other one in with the same amount
> of blurring, then bring the new stream back into focus.
> As far as tone/spectrum goes, smaller grains will generally be
> higher (because they must contain shorter periods) and longer
> grains will have more low frequencies.
> Either way, you'll get modulation artifacts for grains whos period
> is less than 1/F if F is the lowest frequency in the mix, but I assume
> that is okay, just part of the effect.
> On Thu, 11 Jan 2007 13:53:01 -0600
> "Kyle Klipowicz" <kyleklip at gmail.com> wrote:
> > Hello listers~
> >
> > There's been a void of conversation on the list, so I thought I'd
> > pitch my latest idea for a Pd tool:  a granular cross-fader.  I'm in
> > the pre-planning phase right now, and would love to get some
> > ideas/suggestions for how to implement this.
> >
> > Basically what I'd like to have is similar to a DJ cross fader, but
> > using granular methods to stochastically mix two (or more) signals
> > using various common granular ideas (pitch shifting, time stretching,
> > grain size, randomness parameters, overlap, etc.).  This would make
> > transitions much more exciting from a DJ end as well as when mixing
> > two or more signals on a DAW.
> >
> > What are your immediate thoughts/reactions to this?
> >
> > ~Kyle
> >
> > --
> >
> > http://theradioproject.com
> > http://perhapsidid.blogspot.com
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