Looking for other developpers (quadraphonic plugins)


(Uriel Deveaud) #1

Hi, as said in the title, i am looking for other devs, to look at a new set of plugins… quadraphonic oriented… i have made the shematics, ui design and various code testing… but it is much more fun to work in collab… let me know if you are interested… have a nice day
uriel


(Andrew Belt) #2

Perhaps take a look at How polyphonic cables will work in Rack v1. Quadrophonic will still be useful but a bit obsolete.


(Uriel Deveaud) #3

thanks, i ve looked at it… but why you said quadraphonic is a bit obsolete ?


(Andrew Belt) #4

Quadrophony is a subset of polyphonic-supporting modules. If you have a polyphonic cable, you’d need to demux it, run it through a quad module, and then mux it to go back to polyphonic. On the other hand, if you have four cables, you’d need to mux it into a poly cable, run it through your poly module, and then demux it to get four cables again.

So it’s a matter of how often people will be using poly cables vs. a set of four cables to carry their quad signals. The advantage of poly modules is that you don’t have to work with a fixed number of channels (4). You can work with between 1-16.


(Jim T) #5

is this quadrophonic as opposed to stereo?

I’ve been using nysthi quad panner for this, would be interested in other modules too.


(Uriel Deveaud) #6

no, it is 4 mono setup, with independant controls


(Highcarbschwabe) #7

I am actually working on something (using an algorithm I wrote for another purpose) that has multi channel input and output. May I ask what you are planning to do?


(Uriel Deveaud) #8

yes sure, check my github pages :wink:


(Highcarbschwabe) #9

Just had a look at https://github.com/KoreTeknology/Quadraphonic-Plugins-for-VCV-Rack . There is a certain overlap with what I am planning to do - so it is interesting. I have also extensively worked with quadrophonic (or more precisely dual stereo) audio in another context. Please let me ask you:

  1. Why are you particularly intersted in quadrophonic audio? I mean, it is just one of many classes of multichannel formats. Why not go for the generalization and consider quadrophonics a special case? Especially with regard to polyphony/multichannel being supported in Rack 1.0.

  2. About the mixer: Did you take into account that usually some coefficients in your mixer matrix depend on each other if you want results that make sense to the human brain? So for a 4X4matrix you need four four dimensional vectors rather than 16 separate values. It can be difficult to set these values individually. Example: In stereo, you have one pan control that sets two values (scaling factors for the two channels L/R) so that the combination makes sense.


(Skrylar) #10

My naivete dictates that a quad panner’s “panning” component would be controlled with an X/Y pad, although this assumes each speaker is surrounding the listener.


(Highcarbschwabe) #11

Yes, if you look at it this way the 2D pad defines the parameters of a so-called bilinear function that computes the four panning coefficients. As for speaker positions: As long as they are placed in such a way that they form a non self-intersecting quadrilateral, pad parameters can be transformed by an affine transformation.


(Uriel Deveaud) #12

hi hguys, thanks for your answers… i did try most of the devices used in this kind of confifg… but as i wrote the patent before, and i have experiences in live performance with this , i would like to keep going in the same direction.

the 4x4 matrix mixer i am using right now is giving a lot of satisfaction… i would like to get it running in VCV :slight_smile:

of course, if there is anything new, i would try and keep any new effects… thx

here is a simple setup with only one input > 4 outs, with LFOs to move the sound in space and reset sync to bpm…


(Roman Novikov) #13

Why not Nysthi’s Quad Panner?


(Uriel Deveaud) #14

:slight_smile: i know what you think here, it is not the way i do quadraphonic mix… i want to control independently each input and each output via automation sequences, for precision placement and motions. more than the buchla can do, i can create very interesting effect with this.
i tried for the last 20 years all kind of devices to allow me to mix my musique in quadraphonic system… and the only one who works for me is this way… but thanks for the advice anyway.

also, on this version, i have a chain output, to be able to mix surround in octophony or more, depending of the installation :slight_smile: