[chuck-dev] issues with stereo output in chubgraph

[Spencer Salazar]

Hey Michael,

Chubgraphs (and ChuGens) don't support stereo operation at this time. Its
something we've thought a lot about, but wanted to focus on getting mono
operation right before venturing into stereo/multichannel. Thanks for
bringing this issue up though.

For what its worth Chugins do support arbitrary numbers of I/O channels,
but of course requires implementation in C++.

spencer



On Wed, Feb 13, 2013 at 3:18 PM, Michael Heuer <heuermh at gmail.com> wrote:

> Hello,
>
> Following up on my last email about panning at sample rate in a
> chubgraph, the following does not seg fault and sounds reasonable
>
> $ chuck --loop
> [chuck](VM): sporking incoming shred: 1 (panExample.ck)...
> dump 1.000000 1.000000 0.000000 1.000000 -0.019955 1.000000
> ...
> dump -1.000000 -1.000000 -0.019955 1.000000 0.000000 1.000000
>
>
> panExample.ck:
>
> TriOsc osc;
> 220.0 => osc.freq;
> 1.0 => osc.gain;
>
> SqrOsc lfo => blackhole;
> 0.4 => lfo.freq;
> 1.0 => lfo.gain;
>
> osc => Pan2 pan => dac;
>
> spork ~ applyCv();
> spork ~ dump();
>
> 20::second => now;
>
> <<<"done">>>;
>
> fun void applyCv()
> {
>     while (true)
>     {
>         1::samp => now;
>         lfo.last() => pan.pan;
>     }
> }
>
> fun void dump()
> {
>     while (true)
>     {
>         50::ms => now;
>         <<<"dump", lfo.last(), pan.pan(), pan.left.last(),
> pan.left.gain(), pan.right.last(), pan.right.gain()>>>;
>     }
> }
>
>
> But when constructed as a chubgraph as follows, the panning is not heard
>
> $ chuck --loop
> ...
> [chuck](VM): sporking incoming shred: 240 (Pan2Module.ck)...
> "LiCK imported." : (string)
> [chuck](VM): sporking incoming shred: 1 (pan2ModuleExample.ck)...
> dump 1.000000 1.000000 0.000000 1.000000 -0.019955 1.000000
> ...
> dump -1.000000 -1.000000 -0.019955 1.000000 0.000000 1.000000
>
>
> pan2ModuleExample.ck:
>
> TriOsc osc;
> 220.0 => osc.freq;
> 1.0 => osc.gain;
>
> SqrOsc lfo;
> 0.4 => lfo.freq;
> 1.0 => lfo.gain;
>
> Pan2Module pan;
> lfo => pan._cv;
>
> osc => pan => dac;
>
> spork ~ dump();
>
> 20::second => now;
>
> <<<"done">>>;
>
> fun void dump()
> {
>     while (true)
>     {
>         50::ms => now;
>         <<<"dump", lfo.last(), pan.pan.pan(), pan.pan.left.last(),
> pan.pan.left.gain(), pan.pan.right.last(), pan.pan.right.gain()>>>;
>     }
> }
>
> Pan2Module.ck:
>
> public class Pan2Module extends Chubgraph
> {
>     Gain _cv;
>     inlet => Pan2 pan => outlet;
>
>     {
>         _cv => blackhole;
>         spork ~ _tickAtSampleRate();
>     }
>
>     fun void _tickAtSampleRate()
>     {
>         while (true)
>         {
>             1::samp => now;
>             _cv.last() => pan.pan;
>         }
>     }
> }
>
>
> If I use a different LFO, say
>
> SinOsc lfo;
> 0.1 => lfo.freq;
> 1.0 => lfo.gain;
>
> I hear some panning, but it is not as distinct as in the non-chubgraph
> version.  Is there some issue with channel routing between outlet and
> dac in a chubgraph?
>
>    michael
> _______________________________________________
> chuck-dev mailing list
> chuck-dev at lists.cs.princeton.edu
> https://lists.cs.princeton.edu/mailman/listinfo/chuck-dev
>
>
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