[chuck-users] collecting sum signal per-channel of midi-notes

[Michael Heuer]

Peter Billam <pj at pjb.com.au> wrote:
> Greetings.
>
> ( Serious Newbie-warning :-)
>
> So: I want to work with MIDI, and implement the Great Missing
> Midi-Controller, namely a per-channel overdrive distortion
> like the foverdrive,1196 LADSPA plugin. Untested:
>   fun float foverdrive_1196(float x, float drive) {
>     drive - 1.0 => float drivem1;
>     Std.fabs(x) => float fx;
>     return   x*(fx + drive)/(x*x + drivem1*fx + 1.0);
>   }
>
> This means I have to get the TriOsc of the note not into a dac
>   TriOsc t => dac;   // NO!
> but into some code which will add it to the per-channel total.
> I guess those totals will be stored in perhaps LiSa's  ?
>   float cha2drive[16];  // set by nonstandard MIDI controller 87
>   LiSa lisa[16];  // the per-channel total signal of all its notes
>
> But at this point I get brain-overload :-(
> How do I add the TriOsc sample to its LiSa ?  How do I invoke
> foverdrive_1196() on each sample before outputting it to the dac ?

If you are going to shape a wave at sample rate, you want to use a Chugen:

class Foverdrive1196 extends Chugen {
  1.0 => float drive;

  fun float tick(float in) {
    return ...;
  }
}

Then

TriOsc t => Foverdrive1196 over => dac;


> I'm very unsure about "now", too, how it co-ordinates between
> code of all the individual notes and the final "=> dac" step,
> but still executes all these things scattered throughout the code
> in an appropriate order.
>
> Hope this makes sense...
> If I get this solved, I should become more self-maintaining...

Keep it up, this sounds interesting!

   michael