[sdiy] an old serge UI secret and a primordial question

[Fernando de Izuzquiza]

http://www.cgs.synth.net/modules/cgs37_cv_cluster.html

You can do lots of interesting experiments with this circuit.

Read about "MS stereo" (mid side) recording.

When you process two signals AS IF THEY WERE discrete M and S signals  
with an MS matrix (and CGS37 can act as one with interesting  
additions) you get very interesting spatial results, weird and  
beautiful in my opinion.
I have only done this on a computer but using raw analog signals the  
thing gets betterrrr

You can model the signals so they have some timbral relation (as real  
M and S signals) or not, and then just experiment with any pair of  
signals.
You may add a bit of the signal "pretending to be M" to the S signal  
and viceversa as it would happen using an M front mic and an S mic...

BTOH, there are many schematics of a phaser cell that uses a vactrol  
that would be easy to make, so you can experiment with different  
fixed and variable phase shift, etc. in a modular way and not adding  
much noise.


When you play like this some sounds they seem to unfold and become  
solid (= stereo, isn't it?) and you can feel them as part of the  
actual phisycal space... lik eth etimbre spreads  
multidimensionally... maybe that's why you called it sonic terrain?


(does all this make sense? ...it's late...)

Fernando





El 18/04/2007, a las 12:57, Anthony Bisset escribió:

>
> For years i'd wondered why the old serge systems have 2 outputs per
> module given that banana's are naturally multing...  Tonight i  
> understand.
>
> It was a performance related provision.  If you've got a sound at an
> output and you want to take it somewhere else and then disconnect  
> the old
> signal flow without losing continuity, you need 2 physical patching
> points.  Multing would leave you with buried cables that could not be
> disconnected without losing the signal or you could have hanging  
> cables by
> disconnecting at the input ( obnoxious ).  So, having 2 outputs makes
> sense for a live performance system.
>
> Now, i've been fascinated with phase differences between speakers  
> creating
> a sonic terrain within a room.  To experiment more with this concept
> during performances I'm wanting each modules second output to be  
> out of
> phase..  90 degress seems optimal, so just an opamp would do the  
> trick,
> but there might be some simpler way.  Anyone have any suggestions  
> for the
> simplest fixed phase shift circuit?
>
> Is there a type of transformer that will give me 90 rather than
> 180degrees?  without too much hf roll off?  Will a R/C combo  
> accomplish
> this better?  So trivial google couldn't find it.
>
> -anhotep