[NM] [G2] F = ([A*(64-X)+B*(64+X)]*(64-|Y|)+[C*(64+Y)+D*(64-Y)]*(64-|X|))/128/64

[davepnord Peck]

Yup, a group of crossfaders works well, and of course
you can automate it with LFOs instead of a joystick.
Also, you can add more variation by NOT crossfading
1/2 and 3/4 with the same control source -

- crossfade sources 1/2 with LFO "A"

- crossfade sources 3/4 with LFO "B" at a different
frequency

- crossfade the outputs of the first two crossfaders
using a third crossfader with LFO "C" at yet another
frequency.

Now you get a constantly changing mix of the four
signals. I built a few patches based on this idea, and
some of them took it a step further -

First, I used a set of three crossfaders to create a
constantly changing mix of four oscs:

#1 Fat PWM
#2 FM sine osc sweep
#3 Sine thru wavewrapper sweep
#4 Sawttoth hard sync sweep

Then the final osc crossfader output goes through four
different filters in parallel:

#1 Fat LPF with low resonance
#2 Hi resonance HPF
#3 Mid resonance BPF
#4 Vocal filter

...and the outputs of these four filters are sent
through ANOTHER set of three crossfaders with more
asyncronous LFO control. This creates all kinds of
bizarre, sweeping timbre changes. An example is a
patch called "Automatic2.pch", probably in the
archive.


Dave Peck




--- Sebastian Berweck <sberweck at gmx.de> wrote:

>  F =
>
([A*(64-X)+B*(64+X)]*(64-|Y|)+[C*(64+Y)+D*(64-Y)]*(64-|X|))/128/64
> 
> 
> I found this in James Clark book on advanced modular
> programming on the NM
> (with lots of contributions from this very list).
> 
> It's the formula for Vector Synthesis
>
(http://www.cim.mcgill.ca/~clark/nordmodularbook/nm_oscillator.html#vector)
> 
> I just wondered: why isn't it possible to just use
> the crossfaders? (take 4
> Oscs, crossfade between Osc 1/2 and Osc 3/4, control
> both crossfaders with 1
> morph: the X-Axis. Crossfade the output of the the
> X-Axis-crossfaders: the
> Y-Axis).
> 
> I suppose my approach is to simple, but why?
> 
> Cheers,
> sebber
> 
>
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