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    Rms type or Cosine type Crossfade Curves

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    • J
      Jeetender @David Healey
      last edited by

      @David-Healey iam just trying to create a wet dry balance between the two gain modules. iam not using scriptfx node. the earlier script moved the knobs in opposite direction but it was checking the peak volume, so at 50% the overall gain would just goo silent..

      err.jpg

      David HealeyD 1 Reply Last reply Reply Quote 0
      • David HealeyD
        David Healey @Jeetender
        last edited by

        @Jeetender Have you tried using the send container and send effect for this instead?

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        J 1 Reply Last reply Reply Quote 0
        • J
          Jeetender @David Healey
          last edited by

          @David-Healey no i did not, but the thing is there, i still have to balance between the send or wet with Dry. there is no direct wet dry balance in the modules...

          David HealeyD griffinboyG 2 Replies Last reply Reply Quote 0
          • David HealeyD
            David Healey @Jeetender
            last edited by

            @Jeetender What about setting the Gain of the SimpleGain where you want it and using a CC modulator to control the actual value (you can connect the Default value knob to a UI knob, you don't actually need to use a CC). Then you could set any shape you want using the modulation tables.

            611b63e8-5067-43ea-baa5-1cd17ee08750-image.png

            Free HISE Bootcamp Full Course for beginners.
            YouTube Channel - Public HISE tutorials
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            • griffinboyG
              griffinboy @Jeetender
              last edited by

              @Jeetender

              Wet / Dry balance is done using a sin / cosine curve usually.
              You don't need to do any RMS calculations for an equal power curve.

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              • griffinboyG
                griffinboy @Jeetender
                last edited by griffinboy

                @Jeetender

                This is pseudo code.
                It's something like this

                // Equal-power wet/dry crossfade (pseudocode)
                
                // knob range
                value = 0 to 127
                
                // normalize
                t = value / 127.0
                
                
                // equal-power law
                // sin/cos keep total power constant
                wet_lin = sin(t * PI * 0.5)
                dry_lin = cos(t * PI * 0.5)
                
                
                // linear → dB
                // dB = 20 * log10(gain)
                // log10(x) = ln(x) / ln(10)
                
                wet_db = 20 * ln(wet_lin) / ln(10)
                dry_db = 20 * ln(dry_lin) / ln(10)
                
                
                // clamp near zero (avoid -inf)
                if (wet_lin < 0.00001) wet_db = -100
                if (dry_lin < 0.00001) dry_db = -100
                
                
                // apply
                WET.Gain = wet_db
                DRY.Gain = dry_db
                
                
                
                /*
                Behaviour:
                
                t=0
                dry=1.0  (0 dB)
                wet=0.0  (-inf)
                
                t=0.5
                dry≈0.707 (-3 dB)
                wet≈0.707 (-3 dB)
                
                Summed signal power stays constant across the crossfade,
                so the centre position does not sound quieter.
                
                

                This is the kind of question that AI can help you understand.
                Ask chat gpt about it until you get why it works!

                J 1 Reply Last reply Reply Quote 0
                • J
                  Jeetender @David Healey
                  last edited by

                  @David-Healey this works good but still the same issue, at 50% the volume is not constant.

                  said in Rms type or Cosine type Crossfade Curves:

                  @Jeetender What about setting the Gain of the SimpleGain where you want it and using a CC modulator to control the actual value (you can connect the Default value knob to a UI knob, you don't actually need to use a CC). Then you could set any shape you want using the modulation tables.

                  611b63e8-5067-43ea-baa5-1cd17ee08750-image.png

                  David HealeyD 1 Reply Last reply Reply Quote 0
                  • David HealeyD
                    David Healey @Jeetender
                    last edited by

                    @Jeetender said in Rms type or Cosine type Crossfade Curves:

                    this works good but still the same issue, at 50% the volume is not constant.

                    Have you used an equal power curve?

                    Free HISE Bootcamp Full Course for beginners.
                    YouTube Channel - Public HISE tutorials
                    My Patreon - HISE tutorials

                    1 Reply Last reply Reply Quote 0
                    • J
                      Jeetender @griffinboy
                      last edited by

                      @griffinboy chatgpt or other bots aren't familiar with HISE coding yet i believe.. they just get confused with parameters.

                      said in Rms type or Cosine type Crossfade Curves:

                      @Jeetender

                      This is pseudo code.
                      It's something like this

                      // Equal-power wet/dry crossfade (pseudocode)
                      
                      // knob range
                      value = 0 to 127
                      
                      // normalize
                      t = value / 127.0
                      
                      
                      // equal-power law
                      // sin/cos keep total power constant
                      wet_lin = sin(t * PI * 0.5)
                      dry_lin = cos(t * PI * 0.5)
                      
                      
                      // linear → dB
                      // dB = 20 * log10(gain)
                      // log10(x) = ln(x) / ln(10)
                      
                      wet_db = 20 * ln(wet_lin) / ln(10)
                      dry_db = 20 * ln(dry_lin) / ln(10)
                      
                      
                      // clamp near zero (avoid -inf)
                      if (wet_lin < 0.00001) wet_db = -100
                      if (dry_lin < 0.00001) dry_db = -100
                      
                      
                      // apply
                      WET.Gain = wet_db
                      DRY.Gain = dry_db
                      
                      
                      
                      /*
                      Behaviour:
                      
                      t=0
                      dry=1.0  (0 dB)
                      wet=0.0  (-inf)
                      
                      t=0.5
                      dry≈0.707 (-3 dB)
                      wet≈0.707 (-3 dB)
                      
                      Summed signal power stays constant across the crossfade,
                      so the centre position does not sound quieter.
                      
                      

                      This is the kind of question that AI can help you understand.
                      Ask chat gpt about it until you get why it works!

                      griffinboyG 1 Reply Last reply Reply Quote 0
                      • griffinboyG
                        griffinboy @Jeetender
                        last edited by

                        @Jeetender

                        Right but the math works the same way.
                        All you need to do is find the right hise functions in the API for the math calls.

                        1 Reply Last reply Reply Quote 0
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