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    How to build SNEX Playground?

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    • CasmatC
      Casmat @Christoph Hart
      last edited by Casmat

      @Christoph-Hart @d-healey Nice! I found this code on musicdsp.org:

      x < a:
        f(x) = x
      x > a:
        f(x) = a + (x-a)/(1+((x-a)/(1-a))^2)
      x > 1:
        f(x) = (a+1)/2
      

      How would I turn this into something snex can understand? Wouldn't it use if statements and how should X and A be swapped? It's supposed to make a soft saturation

      Thanks!

      i make music

      ustkU 1 Reply Last reply Reply Quote 0
      • d.healeyD
        d.healey @Christoph Hart
        last edited by

        @Christoph-Hart Oh I think I was thinking of the SNEX workbench.

        Libre Wave - Freedom respecting instruments and effects
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        • ustkU
          ustk @Casmat
          last edited by

          @Casmat said in How to build SNEX Playground?:

          x < a:
          f(x) = x
          x > a:
          f(x) = a + (x-a)/(1+((x-a)/(1-a))^2)
          x > 1:
          f(x) = (a+1)/2

          This translates to something like:

          float out = 0.0;
          
          if (x < a)
             out = x;
          else if (x > a)
             out = a + (x - a) / (1.0 + Math.sqr((x - a) / (1.0 - a)));
          else if (x > 1)
             out = (a + 1.0) / 2.0;
          

          Although it can probably be optimised depending on the use case...

          Can't help pressing F5 in the forum...

          CasmatC 1 Reply Last reply Reply Quote 0
          • CasmatC
            Casmat @ustk
            last edited by

            @ustk I was trying to write it out and got this:

            	float getSample(float input, float a)
            	{
            		if(input < a)
            		{
            			return input;
            		}
            		else if(input > 1)
            		{
            			return (a + 1) / 2;
            		}
            		else
            		{
            			return a + (input - a) / (1 + ((input - a) / (1 - a))**2);
            		}
            	}
            

            definitely wrong in all sorts of cases, I haven't ventured into dsp code, and this is by far the deepest, so thanks for helping! Have one more request, how in the world do I put this into the snex code editor? I tried reading the docs on snex, but was a bit stumped. I'm trying to build a saturation in a snex shaper node with one "Saturation" control. How do I continue?

            Thanks a ton!

            i make music

            ustkU 3 Replies Last reply Reply Quote 0
            • ustkU
              ustk @Casmat
              last edited by

              @Casmat The implementation of your function looks like this:

              	float getSample(float s)
              	{
              		//return your stuff here
              	}
              	
              	
              	template <typename ProcessDataType> void process(ProcessDataType& data)
              	{
              		auto f = data.toFrameData();
              		
              		while (f.next())
              		{
              			for (auto& s: f)
              				s = getSample(s);
              		}
              	}
              	
              	
              	template <int C> void processFrame(span<float, C>& data)
              	{
              		for(auto& s: data)
              			s = getSample(s);
              	}
              

              Can't help pressing F5 in the forum...

              CasmatC 1 Reply Last reply Reply Quote 0
              • ustkU
                ustk @Casmat
                last edited by ustk

                @Casmat And as I wrote above, the constants should be float if you don't want to get casting errors

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                • ustkU
                  ustk @Casmat
                  last edited by

                  @Casmat And one other thing, have you tried to plot your formula to see what you get out from it? Because it's going over the -1/+1 gain factor so you either need to scale the output or rework the formula...

                  Can't help pressing F5 in the forum...

                  CasmatC 1 Reply Last reply Reply Quote 0
                  • CasmatC
                    Casmat @ustk
                    last edited by Casmat

                    @ustk thanks for the info! I don’t think ive done anything with the formula, i found it on music dsp and I was clueless from the start on how to get it to be a simple saturator, is the gain factor related to the gain matching on a saturator?

                    Edit: so the gain factor is x?

                    i make music

                    ustkU 2 Replies Last reply Reply Quote 0
                    • ustkU
                      ustk @Casmat
                      last edited by

                      @Casmat So I imagine a is your gain, right?
                      What do you get as a result? Is it at least sounding "something"?
                      Does the level need to be tamed a bit perhaps?

                      Can't help pressing F5 in the forum...

                      CasmatC 1 Reply Last reply Reply Quote 0
                      • CasmatC
                        Casmat @ustk
                        last edited by

                        @ustk as far as I know when looking at it, I thought that x was the input signal and a was the saturation amount

                        i make music

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                        • ustkU
                          ustk @Casmat
                          last edited by

                          @Casmat said in How to build SNEX Playground?:

                          Edit: so the gain factor is x?

                          f(x) means the it's the output, so a should be the gain

                          Can't help pressing F5 in the forum...

                          CasmatC 1 Reply Last reply Reply Quote 0
                          • CasmatC
                            Casmat @ustk
                            last edited by Casmat

                            @ustk ohh yeah! Polynomials (or maybe not)!

                            i make music

                            ustkU 1 Reply Last reply Reply Quote 0
                            • ustkU
                              ustk @Casmat
                              last edited by ustk

                              @Casmat At first, does it look the way you want?

                              ![Screenshot 2023-08-18 at 20.47.17.png](Imgur is temporarily over capacity. Please try again later.)

                              EDIT @Christoph-Hart @Dominik-Mayer Apparently there's still this Imgur over capacity issue that prevents us to see images...

                              Can't help pressing F5 in the forum...

                              CasmatC 1 Reply Last reply Reply Quote 0
                              • CasmatC
                                Casmat @ustk
                                last edited by Casmat

                                @ustk why was there an float s in the arguments? And I should be declaring a as a variable, right? I put the code you gave

                                if (x < a)
                                   out = x;
                                else if (x > a)
                                   out = a + (x - a) / (1.0 + Math.sqr((x - a) / (1.0 - a)));
                                else if (x > 1)
                                   out = (a + 1.0) / 2.0;
                                

                                In the get sample func?

                                Edit: didn’t see your post yet, the img seems broken

                                i make music

                                Christoph HartC 1 Reply Last reply Reply Quote 0
                                • CasmatC
                                  Casmat @ustk
                                  last edited by Casmat

                                  @ustk try using imgbb.com

                                  i make music

                                  ustkU 2 Replies Last reply Reply Quote 0
                                  • Christoph HartC
                                    Christoph Hart @Casmat
                                    last edited by

                                    @Casmat if imgur is over capacity then there‘s nothing we can do except for stop uploading images :)

                                    ustkU 1 Reply Last reply Reply Quote 2
                                    • ustkU
                                      ustk @Christoph Hart
                                      last edited by

                                      @Christoph-Hart Yeah I though it was somehow related to the forum... Or use another provider 😛

                                      Can't help pressing F5 in the forum...

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                                      • ustkU
                                        ustk @Casmat
                                        last edited by

                                        @Casmat

                                        SOS image provider

                                        Can't help pressing F5 in the forum...

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                                        • ustkU
                                          ustk @Casmat
                                          last edited by

                                          @Casmat You definitely need to declare a
                                          At first, make it 0.0
                                          Then add a parameter to control it

                                          Can't help pressing F5 in the forum...

                                          CasmatC 2 Replies Last reply Reply Quote 0
                                          • CasmatC
                                            Casmat @ustk
                                            last edited by Casmat

                                            @ustk shouldn’t the a be from 0-1? And there were some comments under that music dsp post, do we have to do normalization or am I yapping away at nothing?

                                            i make music

                                            CasmatC 1 Reply Last reply Reply Quote 0
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